Who Called Me from Area Code 312?
Quick answerA 312 call usually comes from Chicago or nearby communities, but caller ID can be spoofed, so a local-looking number isn’t proof. If there’s no voicemail, let it go: legitimate callers leave messages.
- No voicemail? Let it go. Real callers leave messages.
- Recognize the pattern? Check the number in the prefix lookup.
- Getting repeats? ActiveArmor® blocks and labels them automatically.
- Same prefix calling again? Compare it against this month’s most-reported 312 prefixes, right on this page.
- Curious who issued a number? Every 312 prefix belongs to a carrier — the registry names it.
Been targeted?Report the call at reportfraud.ftc.gov — reports feed the complaint data that powers spam blocking, including the board on this page. AT&T customers already have ActiveArmor® screening built in.
Most-reported 312 prefixes this month
PrefixReported patternReport volume
(312) 381-XXXXRobocall-heavy
(312) 471-XXXXRobocall-heavy
(312) 962-XXXXRobocall-heavy
(312) 426-XXXXRobocall-heavy
(312) 449-XXXXRobocall-heavy
163 unwanted-call reports naming 312 numbers in FTC Do Not Call complaint data, July 2–17, 2026. Consumer-reported and unverified.
Block spam calls in the 312, included with AT&T wireless
AT&T ActiveArmor® is the network-level security that screens the calls this page is about:
- Fraud calls blocked automatically on the network
- Suspected spam labeled before you answer
- Caller ID & custom call blocking in the free app
- Reverse number lookup (available with ActiveArmor Advanced security. Fee required.)
- Identity monitoring & identity theft insurance (available with ActiveArmor Advanced security. Fee required.)
Included with AT&T wireless plans. Requires compatible device/service and download of the AT&T ActiveArmor® app. Other terms & restrictions apply. May not detect all threats and may block wanted calls. Some features require Advanced mobile security ($7/mo.). See terms.
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Is Area Code 312 a Scam?
No. 312 is a legitimate Chicago area code.
It’s one of the original 1947 codes and serves downtown Chicago. But legitimacy of the code says nothing about any single call. Scammers spoof local numbers constantly.
The code is realOriginal 1947 code for the Chicago area with 785 assigned carrier prefixes.
Spoofing happens“Neighbor spoofing” fakes local numbers. No voicemail? Let it go.
Screening includedActiveArmor® labels and blocks suspected spam. Included with AT&T wireless plans.
Been targeted? Report it to the FTC at reportfraud.ftc.gov. Reports feed the complaint data that powers spam blocking.
Scam texts from area code 312 numbers
The most common area code 312 text scam is the “wrong number” opener: a friendly message that pretends to know you, then moves the chat to WhatsApp and eventually to an investment pitch. Scripts currently circulating:
- “U at home?” · “Are you busy tomorrow?” · “How are you doing?”
- Delivery-problem and job-offer texts that link out to a login page
Don’t reply. A response marks your number as live. Forward scam texts to 7726 (SPAM), and AT&T ActiveArmor® filters known senders automatically.
How number spoofing works in area code 312
Caller ID is easy to forge. Spoofing fakes the number a call displays. The real owner of that 312 number isn’t involved and usually has no idea. That’s why blocking one number rarely stops the calls.
- A call from a number almost identical to yours (same 312 and prefix) is “mirror spoofing.” A missed call from your own number is never worth returning.
- Strangers calling you back saying you called them? Your 312 number is being spoofed. It typically passes within days, and you don’t need a new number. Report it at reportfraud.ftc.gov.
- The caller-ID checkmark: AT&T verifies network calls (STIR/SHAKEN). A verified mark means the displayed number wasn’t faked. No mark doesn’t always mean scam, but treat it with more caution.
Spoofed or not, the rule holds: unexpected caller, no voicemail? Let it go.
312 Area Code Prefix & Carrier Lookup
The three digits after the area code identify the carrier a number was issued to. All 785 assigned 312 prefixes below are real, from the public numbering registry. Type to filter.
This isn’t a reverse phone lookup: no legitimate free service can tell you who owns a specific number. What a 312 prefix does show: the carrier that issued it, whether it’s wireless, landline or VoIP, and the community it belongs to, which is often enough to judge whether a call was worth returning.
785 prefixes · updated monthly
| Prefix | Carrier | Line type |
|---|---|---|
| 312-200 | Metro by T-Mobile (MetroPCS) | Landline / VoIP |
| 312-201 | AT&T Midwest (Illinois Bell) | Landline |
| 312-202 | AT&T Midwest (Illinois Bell) | Landline |
| 312-203 | AT&T Mobility | Wireless |
| 312-204 | AT&T Midwest (Illinois Bell) | Landline |
| 312-205 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-206 | AT&T Mobility | Wireless |
| 312-207 | AT&T Midwest (Illinois Bell) | Landline |
| 312-208 | AT&T Mobility | Wireless |
| 312-209 | Verizon Wireless | Wireless |
| 312-210 | Peerless Network | Landline / VoIP |
| 312-212 | AT&T Midwest (Illinois Bell) | Landline |
| 312-213 | AT&T Mobility | Wireless |
| 312-214 | AT&T Midwest (Illinois Bell) | Landline |
| 312-215 | AT&T Mobility | Wireless |
| 312-216 | First Communications | Landline / VoIP |
| 312-217 | T-Mobile | Wireless |
| 312-218 | AT&T Mobility | Wireless |
| 312-219 | Bandwidth.com | Landline / VoIP |
| 312-220 | AT&T Midwest (Illinois Bell) | Landline |
| 312-221 | T-Mobile | Wireless |
| 312-222 | AT&T Midwest (Illinois Bell) | Landline |
| 312-223 | AT&T Midwest (Illinois Bell) | Landline |
| 312-224 | Lumen (Level 3) | Landline / VoIP |
| 312-225 | AT&T Midwest (Illinois Bell) | Landline |
| 312-226 | AT&T Midwest (Illinois Bell) | Landline |
| 312-227 | AT&T Midwest (Illinois Bell) | Landline |
| 312-228 | AT&T Midwest (Illinois Bell) | Landline |
| 312-229 | AT&T Midwest (Illinois Bell) | Landline |
| 312-230 | AT&T Midwest (Illinois Bell) | Landline |
| 312-231 | AT&T Mobility | Wireless |
| 312-232 | American Messaging (paging) | Wireless |
| 312-233 | AT&T Midwest (Illinois Bell) | Landline |
| 312-234 | AT&T Midwest (Illinois Bell) | Landline |
| 312-235 | AT&T Midwest (Illinois Bell) | Landline |
| 312-236 | AT&T Midwest (Illinois Bell) | Landline |
| 312-237 | Verizon Wireless | Wireless |
| 312-238 | Lumen (Level 3) | Landline / VoIP |
| 312-239 | AT&T Local | Landline / VoIP |
| 312-240 | AT&T Midwest (Illinois Bell) | Landline |
| 312-241 | AT&T Mobility | Wireless |
| 312-242 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-243 | AT&T Midwest (Illinois Bell) | Landline |
| 312-244 | AT&T Midwest (Illinois Bell) | Landline |
| 312-245 | AT&T Midwest (Illinois Bell) | Landline |
| 312-246 | AT&T Mobility | Wireless |
| 312-247 | First Communications | Landline / VoIP |
| 312-248 | Metro by T-Mobile (MetroPCS) | Landline / VoIP |
| 312-249 | Spok (paging) | Landline / VoIP |
| 312-250 | Spok (paging) | Landline / VoIP |
| 312-251 | AT&T Midwest (Illinois Bell) | Landline |
| 312-252 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-253 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-254 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-255 | AT&T Midwest (Illinois Bell) | Landline |
| 312-256 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-257 | Verizon Wireless | Wireless |
| 312-258 | AT&T Midwest (Illinois Bell) | Landline |
| 312-259 | AT&T Mobility | Wireless |
| 312-260 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-261 | Lumen (Level 3) | Landline / VoIP |
| 312-262 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-263 | AT&T Midwest (Illinois Bell) | Landline |
| 312-264 | Lumen (Level 3) | Landline / VoIP |
| 312-265 | Access One | Landline / VoIP |
| 312-266 | AT&T Midwest (Illinois Bell) | Landline |
| 312-267 | AT&T Midwest (Illinois Bell) | Landline |
| 312-268 | Lumen (Level 3) | Landline / VoIP |
| 312-269 | AT&T Midwest (Illinois Bell) | Landline |
| 312-270 | Metro by T-Mobile (MetroPCS) | Landline / VoIP |
| 312-271 | Spok (paging) | Landline / VoIP |
| 312-272 | Spok (paging) | Landline / VoIP |
| 312-273 | Verizon Wireless | Wireless |
| 312-274 | AT&T Midwest (Illinois Bell) | Landline |
| 312-275 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-276 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-277 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-278 | Lumen (Level 3) | Landline / VoIP |
| 312-279 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-280 | AT&T Midwest (Illinois Bell) | Landline |
| 312-281 | Lumen (Level 3) | Landline / VoIP |
| 312-282 | AT&T Mobility | Wireless |
| 312-283 | Lumen (Level 3) | Landline / VoIP |
| 312-284 | XO (Verizon) | Landline / VoIP |
| 312-285 | T-Mobile | Wireless |
| 312-286 | AT&T Mobility | Wireless |
| 312-287 | T-Mobile | Wireless |
| 312-288 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-289 | Spok (paging) | Landline / VoIP |
| 312-290 | Spok (paging) | Landline / VoIP |
| 312-291 | AT&T Midwest (Illinois Bell) | Landline |
| 312-292 | Bandwidth.com | Landline / VoIP |
| 312-293 | AT&T Midwest (Illinois Bell) | Landline |
| 312-294 | AT&T Midwest (Illinois Bell) | Landline |
| 312-295 | Spok (paging) | Landline / VoIP |
| 312-296 | T-Mobile | Wireless |
| 312-297 | AT&T Midwest (Illinois Bell) | Landline |
| 312-298 | RCN (Astound) | Landline / VoIP |
| 312-299 | Spok (paging) | Landline / VoIP |
| 312-300 | Lumen (Level 3) | Landline / VoIP |
| 312-301 | AT&T Mobility | Wireless |
| 312-302 | AT&T Midwest (Illinois Bell) | Landline |
| 312-303 | AT&T Mobility | Wireless |
| 312-304 | AT&T Mobility | Wireless |
| 312-305 | Verizon Wireless | Wireless |
| 312-306 | AT&T Midwest (Illinois Bell) | Landline |
| 312-307 | AT&T Mobility | Wireless |
| 312-308 | AT&T Midwest (Illinois Bell) | Landline |
| 312-309 | AT&T Midwest (Illinois Bell) | Landline |
| 312-310 | Verizon Wireless | Wireless |
| 312-312 | Onvoy (Sinch) | Landline / VoIP |
| 312-313 | Onvoy (Sinch) | Landline / VoIP |
| 312-314 | AT&T Mobility | Wireless |
| 312-315 | AT&T Mobility | Wireless |
| 312-316 | AT&T Mobility | Wireless |
| 312-317 | AT&T Mobility | Wireless |
| 312-318 | Verizon Wireless | Wireless |
| 312-319 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-320 | AT&T Mobility | Wireless |
| 312-321 | AT&T Midwest (Illinois Bell) | Landline |
| 312-322 | AT&T Midwest (Illinois Bell) | Landline |
| 312-323 | American Messaging (paging) | Wireless |
| 312-324 | Lumen (Level 3) | Landline / VoIP |
| 312-325 | AT&T Midwest (Illinois Bell) | Landline |
| 312-326 | AT&T Midwest (Illinois Bell) | Landline |
| 312-327 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-328 | AT&T Midwest (Illinois Bell) | Landline |
| 312-329 | AT&T Midwest (Illinois Bell) | Landline |
| 312-330 | AT&T Mobility | Wireless |
| 312-331 | AT&T Mobility | Wireless |
| 312-332 | AT&T Midwest (Illinois Bell) | Landline |
| 312-333 | American Messaging (paging) | Wireless |
| 312-334 | First Communications | Landline / VoIP |
| 312-335 | AT&T Midwest (Illinois Bell) | Landline |
| 312-336 | AT&T Midwest (Illinois Bell) | Landline |
| 312-337 | AT&T Midwest (Illinois Bell) | Landline |
| 312-338 | AT&T Midwest (Illinois Bell) | Landline |
| 312-339 | Verizon Wireless | Wireless |
| 312-340 | T-Mobile | Wireless |
| 312-341 | AT&T Midwest (Illinois Bell) | Landline |
| 312-342 | AT&T Mobility | Wireless |
| 312-343 | Verizon Wireless | Wireless |
| 312-344 | AT&T Midwest (Illinois Bell) | Landline |
| 312-345 | AT&T Midwest (Illinois Bell) | Landline |
| 312-346 | AT&T Midwest (Illinois Bell) | Landline |
| 312-347 | AT&T Midwest (Illinois Bell) | Landline |
| 312-348 | Onvoy (Sinch) | Landline / VoIP |
| 312-349 | Spok (paging) | Landline / VoIP |
| 312-350 | Verizon Wireless | Wireless |
| 312-351 | AT&T Mobility | Wireless |
| 312-352 | AT&T Mobility | Wireless |
| 312-353 | AT&T Midwest (Illinois Bell) | Landline |
| 312-354 | AT&T Mobility | Wireless |
| 312-355 | AT&T Midwest (Illinois Bell) | Landline |
| 312-356 | AT&T Midwest (Illinois Bell) | Landline |
| 312-357 | AT&T Midwest (Illinois Bell) | Landline |
| 312-358 | T-Mobile | Wireless |
| 312-359 | Spok (paging) | Landline / VoIP |
| 312-360 | AT&T Midwest (Illinois Bell) | Landline |
| 312-361 | AT&T Midwest (Illinois Bell) | Landline |
| 312-362 | AT&T Midwest (Illinois Bell) | Landline |
| 312-363 | RCN (Astound) | Landline / VoIP |
| 312-364 | AT&T Midwest (Illinois Bell) | Landline |
| 312-365 | Spok (paging) | Landline / VoIP |
| 312-366 | AT&T Mobility | Wireless |
| 312-367 | Spok (paging) | Landline / VoIP |
| 312-368 | AT&T Midwest (Illinois Bell) | Landline |
| 312-369 | AT&T Mobility | Wireless |
| 312-370 | Spok (paging) | Landline / VoIP |
| 312-371 | T-Mobile | Wireless |
| 312-372 | AT&T Midwest (Illinois Bell) | Landline |
| 312-373 | Lumen (Level 3) | Landline / VoIP |
| 312-374 | AT&T Midwest (Illinois Bell) | Landline |
| 312-375 | T-Mobile | Wireless |
| 312-376 | Onvoy (Sinch) | Landline / VoIP |
| 312-377 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-378 | Spok (paging) | Landline / VoIP |
| 312-379 | Windstream (Paetec) | Landline / VoIP |
| 312-380 | AT&T Midwest (Illinois Bell) | Landline |
| 312-381 | AT&T Midwest (Illinois Bell) | Landline |
| 312-382 | AT&T Midwest (Illinois Bell) | Landline |
| 312-383 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-384 | AT&T Midwest (Illinois Bell) | Landline |
| 312-385 | AT&T Midwest (Illinois Bell) | Landline |
| 312-386 | AT&T Midwest (Illinois Bell) | Landline |
| 312-387 | Spok (paging) | Landline / VoIP |
| 312-388 | T-Mobile | Wireless |
| 312-389 | Spok (paging) | Landline / VoIP |
| 312-390 | American Messaging (paging) | Wireless |
| 312-391 | AT&T Mobility | Wireless |
| 312-392 | Onvoy (Sinch) | Landline / VoIP |
| 312-393 | American Messaging (paging) | Wireless |
| 312-394 | AT&T Midwest (Illinois Bell) | Landline |
| 312-395 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-396 | AT&T Midwest (Illinois Bell) | Landline |
| 312-397 | AT&T Midwest (Illinois Bell) | Landline |
| 312-398 | Spok (paging) | Landline / VoIP |
| 312-399 | T-Mobile | Wireless |
| 312-400 | American Messaging (paging) | Wireless |
| 312-401 | AT&T Mobility | Wireless |
| 312-402 | AT&T Mobility | Wireless |
| 312-403 | Verizon Wireless | Wireless |
| 312-404 | T-Mobile | Wireless |
| 312-405 | Verizon Wireless | Wireless |
| 312-406 | AT&T Mobility | Wireless |
| 312-407 | AT&T Midwest (Illinois Bell) | Landline |
| 312-408 | AT&T Midwest (Illinois Bell) | Landline |
| 312-409 | AT&T Midwest (Illinois Bell) | Landline |
| 312-410 | AT&T Midwest (Illinois Bell) | Landline |
| 312-412 | AT&T Mobility | Wireless |
| 312-413 | AT&T Midwest (Illinois Bell) | Landline |
| 312-414 | Vonage | Landline / VoIP |
| 312-415 | Verizon Wireless | Wireless |
| 312-416 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-417 | AT&T Midwest (Illinois Bell) | Landline |
| 312-418 | Spok (paging) | Landline / VoIP |
| 312-419 | AT&T Midwest (Illinois Bell) | Landline |
| 312-420 | AT&T Mobility | Wireless |
| 312-421 | AT&T Midwest (Illinois Bell) | Landline |
| 312-422 | AT&T Midwest (Illinois Bell) | Landline |
| 312-423 | Lumen (Level 3) | Landline / VoIP |
| 312-424 | AT&T Midwest (Illinois Bell) | Landline |
| 312-425 | AT&T Midwest (Illinois Bell) | Landline |
| 312-426 | Onvoy (Sinch) | Landline / VoIP |
| 312-427 | AT&T Midwest (Illinois Bell) | Landline |
| 312-428 | Lumen (Level 3) | Landline / VoIP |
| 312-429 | Lumen (Level 3) | Landline / VoIP |
| 312-430 | AT&T Midwest (Illinois Bell) | Landline |
| 312-431 | AT&T Midwest (Illinois Bell) | Landline |
| 312-432 | AT&T Midwest (Illinois Bell) | Landline |
| 312-433 | AT&T Midwest (Illinois Bell) | Landline |
| 312-434 | T-Mobile | Wireless |
| 312-435 | AT&T Midwest (Illinois Bell) | Landline |
| 312-436 | AT&T Midwest (Illinois Bell) | Landline |
| 312-437 | Metro by T-Mobile (MetroPCS) | Landline / VoIP |
| 312-438 | Verizon Wireless | Wireless |
| 312-439 | AT&T Mobility | Wireless |
| 312-440 | AT&T Midwest (Illinois Bell) | Landline |
| 312-441 | AT&T Midwest (Illinois Bell) | Landline |
| 312-442 | AT&T Midwest (Illinois Bell) | Landline |
| 312-443 | AT&T Midwest (Illinois Bell) | Landline |
| 312-444 | AT&T Midwest (Illinois Bell) | Landline |
| 312-445 | AT&T Midwest (Illinois Bell) | Landline |
| 312-446 | T-Mobile | Wireless |
| 312-447 | AT&T Midwest (Illinois Bell) | Landline |
| 312-448 | Verizon Wireless | Wireless |
| 312-449 | Wavenation | Landline / VoIP |
| 312-450 | AT&T Mobility | Wireless |
| 312-451 | T-Mobile | Wireless |
| 312-452 | Onvoy Spectrum (Sinch) | Wireless |
| 312-453 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-454 | AT&T Midwest (Illinois Bell) | Landline |
| 312-455 | AT&T Midwest (Illinois Bell) | Landline |
| 312-456 | AT&T Midwest (Illinois Bell) | Landline |
| 312-457 | American Messaging (paging) | Wireless |
| 312-458 | AT&T Midwest (Illinois Bell) | Landline |
| 312-459 | T-Mobile | Wireless |
| 312-460 | AT&T Midwest (Illinois Bell) | Landline |
| 312-461 | AT&T Midwest (Illinois Bell) | Landline |
| 312-462 | AT&T Midwest (Illinois Bell) | Landline |
| 312-463 | AT&T Midwest (Illinois Bell) | Landline |
| 312-464 | AT&T Midwest (Illinois Bell) | Landline |
| 312-465 | Windstream (Paetec) | Landline / VoIP |
| 312-466 | AT&T Midwest (Illinois Bell) | Landline |
| 312-467 | AT&T Midwest (Illinois Bell) | Landline |
| 312-468 | T-Mobile | Wireless |
| 312-469 | AT&T Midwest (Illinois Bell) | Landline |
| 312-470 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-471 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-472 | AT&T Midwest (Illinois Bell) | Landline |
| 312-473 | Onvoy (Sinch) | Landline / VoIP |
| 312-474 | AT&T Midwest (Illinois Bell) | Landline |
| 312-475 | AT&T Midwest (Illinois Bell) | Landline |
| 312-476 | T-Mobile | Wireless |
| 312-477 | Lumen (Level 3) | Landline / VoIP |
| 312-478 | T-Mobile | Wireless |
| 312-479 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-480 | AT&T Mobility | Wireless |
| 312-481 | Metro by T-Mobile (MetroPCS) | Landline / VoIP |
| 312-482 | AT&T Midwest (Illinois Bell) | Landline |
| 312-483 | T-Mobile | Wireless |
| 312-484 | Spok (paging) | Landline / VoIP |
| 312-485 | Verizon Wireless | Wireless |
| 312-486 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-487 | Metro by T-Mobile (MetroPCS) | Landline / VoIP |
| 312-488 | Lumen (Level 3) | Landline / VoIP |
| 312-489 | Verizon Wireless | Wireless |
| 312-490 | Spok (paging) | Landline / VoIP |
| 312-491 | AT&T Midwest (Illinois Bell) | Landline |
| 312-492 | AT&T Midwest (Illinois Bell) | Landline |
| 312-493 | T-Mobile | Wireless |
| 312-494 | AT&T Midwest (Illinois Bell) | Landline |
| 312-495 | Spok (paging) | Landline / VoIP |
| 312-496 | AT&T Midwest (Illinois Bell) | Landline |
| 312-497 | Verizon Wireless | Wireless |
| 312-498 | T-Mobile | Wireless |
| 312-499 | AT&T Midwest (Illinois Bell) | Landline |
| 312-500 | Onvoy (Sinch) | Landline / VoIP |
| 312-501 | Verizon Wireless | Wireless |
| 312-502 | Verizon Wireless | Wireless |
| 312-503 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-504 | AT&T Mobility | Wireless |
| 312-505 | Verizon Wireless | Wireless |
| 312-506 | First Communications | Landline / VoIP |
| 312-507 | AT&T Midwest (Illinois Bell) | Landline |
| 312-508 | Peerless Network | Landline / VoIP |
| 312-509 | Peerless Network | Landline / VoIP |
| 312-510 | AT&T Mobility | Wireless |
| 312-512 | Spok (paging) | Landline / VoIP |
| 312-513 | AT&T Mobility | Wireless |
| 312-514 | American Messaging (paging) | Wireless |
| 312-515 | Verizon Wireless | Wireless |
| 312-516 | AT&T Midwest (Illinois Bell) | Landline |
| 312-517 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-518 | AT&T Mobility | Wireless |
| 312-519 | Verizon Wireless | Wireless |
| 312-520 | Verizon Wireless | Wireless |
| 312-521 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-522 | T-Mobile | Wireless |
| 312-523 | T-Mobile | Wireless |
| 312-524 | AT&T Mobility | Wireless |
| 312-525 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-526 | AT&T Midwest (Illinois Bell) | Landline |
| 312-527 | AT&T Midwest (Illinois Bell) | Landline |
| 312-528 | AT&T Midwest (Illinois Bell) | Landline |
| 312-529 | AT&T Local | Landline / VoIP |
| 312-530 | Stratus Networks | Landline / VoIP |
| 312-531 | AT&T Mobility | Wireless |
| 312-532 | T-Mobile | Wireless |
| 312-533 | Verizon Wireless | Wireless |
| 312-534 | AT&T Midwest (Illinois Bell) | Landline |
| 312-535 | Bandwidth.com | Landline / VoIP |
| 312-536 | T-Mobile | Wireless |
| 312-537 | AT&T Midwest (Illinois Bell) | Landline |
| 312-538 | Metro by T-Mobile (MetroPCS) | Landline / VoIP |
| 312-539 | T-Mobile | Wireless |
| 312-540 | AT&T Midwest (Illinois Bell) | Landline |
| 312-541 | AT&T Midwest (Illinois Bell) | Landline |
| 312-542 | AT&T Midwest (Illinois Bell) | Landline |
| 312-543 | AT&T Mobility | Wireless |
| 312-544 | AT&T Midwest (Illinois Bell) | Landline |
| 312-545 | T-Mobile | Wireless |
| 312-546 | Lumen (Level 3) | Landline / VoIP |
| 312-547 | AT&T Mobility | Wireless |
| 312-548 | Lumen (Level 3) | Landline / VoIP |
| 312-549 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-550 | Verizon Wireless | Wireless |
| 312-551 | AT&T Midwest (Illinois Bell) | Landline |
| 312-552 | AT&T Midwest (Illinois Bell) | Landline |
| 312-553 | AT&T Midwest (Illinois Bell) | Landline |
| 312-554 | AT&T Midwest (Illinois Bell) | Landline |
| 312-556 | AT&T Midwest (Illinois Bell) | Landline |
| 312-557 | AT&T Midwest (Illinois Bell) | Landline |
| 312-558 | AT&T Midwest (Illinois Bell) | Landline |
| 312-559 | AT&T Midwest (Illinois Bell) | Landline |
| 312-560 | AT&T Mobility | Wireless |
| 312-561 | Verizon Wireless | Wireless |
| 312-562 | Spok (paging) | Landline / VoIP |
| 312-563 | AT&T Midwest (Illinois Bell) | Landline |
| 312-564 | First Communications | Landline / VoIP |
| 312-565 | AT&T Midwest (Illinois Bell) | Landline |
| 312-566 | AT&T Midwest (Illinois Bell) | Landline |
| 312-567 | AT&T Midwest (Illinois Bell) | Landline |
| 312-568 | AT&T Midwest (Illinois Bell) | Landline |
| 312-569 | AT&T Midwest (Illinois Bell) | Landline |
| 312-570 | AT&T Midwest (Illinois Bell) | Landline |
| 312-571 | Spok (paging) | Landline / VoIP |
| 312-572 | AT&T Midwest (Illinois Bell) | Landline |
| 312-573 | AT&T Midwest (Illinois Bell) | Landline |
| 312-574 | AT&T Midwest (Illinois Bell) | Landline |
| 312-575 | AT&T Midwest (Illinois Bell) | Landline |
| 312-576 | AT&T Mobility | Wireless |
| 312-577 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-578 | AT&T Midwest (Illinois Bell) | Landline |
| 312-579 | Verizon Wireless | Wireless |
| 312-580 | AT&T Midwest (Illinois Bell) | Landline |
| 312-581 | AT&T Mobility | Wireless |
| 312-582 | AT&T Midwest (Illinois Bell) | Landline |
| 312-583 | AT&T Midwest (Illinois Bell) | Landline |
| 312-584 | Voip Innovations | Landline / VoIP |
| 312-585 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-586 | Onvoy (Sinch) | Landline / VoIP |
| 312-587 | AT&T Midwest (Illinois Bell) | Landline |
| 312-588 | AT&T Midwest (Illinois Bell) | Landline |
| 312-589 | AT&T Midwest (Illinois Bell) | Landline |
| 312-590 | Verizon Wireless | Wireless |
| 312-591 | AT&T Midwest (Illinois Bell) | Landline |
| 312-592 | AT&T Midwest (Illinois Bell) | Landline |
| 312-593 | T-Mobile | Wireless |
| 312-594 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-595 | AT&T Midwest (Illinois Bell) | Landline |
| 312-596 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-597 | Verizon Wireless | Wireless |
| 312-598 | Onvoy (Sinch) | Landline / VoIP |
| 312-599 | Verizon Wireless | Wireless |
| 312-600 | Onvoy (Sinch) | Landline / VoIP |
| 312-601 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-602 | Lumen (Level 3) | Landline / VoIP |
| 312-603 | AT&T Midwest (Illinois Bell) | Landline |
| 312-604 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-605 | Windstream (Paetec) | Landline / VoIP |
| 312-606 | AT&T Midwest (Illinois Bell) | Landline |
| 312-607 | AT&T Mobility | Wireless |
| 312-608 | AT&T Mobility | Wireless |
| 312-609 | AT&T Midwest (Illinois Bell) | Landline |
| 312-610 | Verizon Wireless | Wireless |
| 312-612 | AT&T Midwest (Illinois Bell) | Landline |
| 312-613 | AT&T Mobility | Wireless |
| 312-614 | AT&T Midwest (Illinois Bell) | Landline |
| 312-615 | AT&T Mobility | Wireless |
| 312-616 | AT&T Midwest (Illinois Bell) | Landline |
| 312-617 | T-Mobile | Wireless |
| 312-618 | AT&T Mobility | Wireless |
| 312-619 | T-Mobile | Wireless |
| 312-620 | Bandwidth.com | Landline / VoIP |
| 312-621 | AT&T Midwest (Illinois Bell) | Landline |
| 312-622 | AT&T Mobility | Wireless |
| 312-623 | AT&T Mobility | Wireless |
| 312-624 | RCN (Astound) | Landline / VoIP |
| 312-625 | Lumen (Level 3) | Landline / VoIP |
| 312-626 | Onvoy (Sinch) | Landline / VoIP |
| 312-627 | AT&T Midwest (Illinois Bell) | Landline |
| 312-628 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-629 | AT&T Midwest (Illinois Bell) | Landline |
| 312-630 | AT&T Midwest (Illinois Bell) | Landline |
| 312-631 | Lumen (CenturyLink) | Landline / VoIP |
| 312-632 | AT&T Midwest (Illinois Bell) | Landline |
| 312-633 | AT&T Midwest (Illinois Bell) | Landline |
| 312-634 | AT&T Midwest (Illinois Bell) | Landline |
| 312-635 | Lumen (Level 3) | Landline / VoIP |
| 312-636 | Verizon Wireless | Wireless |
| 312-637 | Lumen (Level 3) | Landline / VoIP |
| 312-638 | Lumen (Level 3) | Landline / VoIP |
| 312-639 | Verizon Wireless | Wireless |
| 312-640 | AT&T Midwest (Illinois Bell) | Landline |
| 312-641 | AT&T Midwest (Illinois Bell) | Landline |
| 312-642 | AT&T Midwest (Illinois Bell) | Landline |
| 312-643 | RCN (Astound) | Landline / VoIP |
| 312-644 | AT&T Midwest (Illinois Bell) | Landline |
| 312-645 | AT&T Midwest (Illinois Bell) | Landline |
| 312-646 | Lumen (Level 3) | Landline / VoIP |
| 312-647 | T-Mobile | Wireless |
| 312-648 | AT&T Midwest (Illinois Bell) | Landline |
| 312-649 | AT&T Midwest (Illinois Bell) | Landline |
| 312-650 | RCN (Astound) | Landline / VoIP |
| 312-651 | AT&T Midwest (Illinois Bell) | Landline |
| 312-652 | AT&T Midwest (Illinois Bell) | Landline |
| 312-653 | AT&T Midwest (Illinois Bell) | Landline |
| 312-654 | AT&T Midwest (Illinois Bell) | Landline |
| 312-655 | AT&T Midwest (Illinois Bell) | Landline |
| 312-656 | T-Mobile | Wireless |
| 312-657 | Spok (paging) | Landline / VoIP |
| 312-658 | AT&T Midwest (Illinois Bell) | Landline |
| 312-659 | AT&T Mobility | Wireless |
| 312-660 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-661 | AT&T Midwest (Illinois Bell) | Landline |
| 312-662 | AT&T Midwest (Illinois Bell) | Landline |
| 312-663 | AT&T Midwest (Illinois Bell) | Landline |
| 312-664 | AT&T Midwest (Illinois Bell) | Landline |
| 312-665 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-666 | AT&T Midwest (Illinois Bell) | Landline |
| 312-667 | Peerless Network | Landline / VoIP |
| 312-668 | Csc Wireless | Wireless |
| 312-669 | AT&T Midwest (Illinois Bell) | Landline |
| 312-670 | AT&T Midwest (Illinois Bell) | Landline |
| 312-671 | Metro by T-Mobile (MetroPCS) | Landline / VoIP |
| 312-672 | AT&T Midwest (Illinois Bell) | Landline |
| 312-673 | First Communications | Landline / VoIP |
| 312-674 | AT&T Midwest (Illinois Bell) | Landline |
| 312-675 | AT&T Midwest (Illinois Bell) | Landline |
| 312-676 | First Communications | Landline / VoIP |
| 312-677 | Spok (paging) | Landline / VoIP |
| 312-678 | T-Mobile | Wireless |
| 312-679 | TPx Communications | Landline / VoIP |
| 312-680 | Onvoy (Sinch) | Landline / VoIP |
| 312-681 | AT&T Midwest (Illinois Bell) | Landline |
| 312-682 | Nuso | Landline / VoIP |
| 312-683 | AT&T Midwest (Illinois Bell) | Landline |
| 312-684 | T-Mobile | Wireless |
| 312-685 | Metro by T-Mobile (MetroPCS) | Landline / VoIP |
| 312-686 | Peerless Network | Landline / VoIP |
| 312-687 | T-Mobile | Wireless |
| 312-688 | Spok (paging) | Landline / VoIP |
| 312-689 | American Messaging (paging) | Wireless |
| 312-690 | Lumen (Level 3) | Landline / VoIP |
| 312-691 | Indiana Paging Network | Wireless |
| 312-692 | AT&T Midwest (Illinois Bell) | Landline |
| 312-693 | AT&T Midwest (Illinois Bell) | Landline |
| 312-694 | AT&T Midwest (Illinois Bell) | Landline |
| 312-695 | AT&T Midwest (Illinois Bell) | Landline |
| 312-696 | AT&T Midwest (Illinois Bell) | Landline |
| 312-697 | AT&T Midwest (Illinois Bell) | Landline |
| 312-698 | Lumen (Level 3) | Landline / VoIP |
| 312-699 | AT&T Mobility | Wireless |
| 312-701 | AT&T Midwest (Illinois Bell) | Landline |
| 312-702 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-703 | AT&T Midwest (Illinois Bell) | Landline |
| 312-704 | AT&T Midwest (Illinois Bell) | Landline |
| 312-705 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-706 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-707 | AT&T Midwest (Illinois Bell) | Landline |
| 312-708 | Onvoy Spectrum (Sinch) | Wireless |
| 312-709 | T-Mobile | Wireless |
| 312-710 | AT&T Midwest (Illinois Bell) | Landline |
| 312-712 | AT&T Midwest (Illinois Bell) | Landline |
| 312-713 | American Messaging (paging) | Wireless |
| 312-714 | AT&T Midwest (Illinois Bell) | Landline |
| 312-715 | AT&T Midwest (Illinois Bell) | Landline |
| 312-716 | AT&T Midwest (Illinois Bell) | Landline |
| 312-717 | Spok (paging) | Landline / VoIP |
| 312-718 | Verizon Wireless | Wireless |
| 312-719 | T-Mobile | Wireless |
| 312-720 | Verizon Wireless | Wireless |
| 312-721 | T-Mobile | Wireless |
| 312-722 | Windstream (Paetec) | Landline / VoIP |
| 312-723 | AT&T Mobility | Wireless |
| 312-724 | Bandwidth.com | Landline / VoIP |
| 312-725 | Bandwidth.com | Landline / VoIP |
| 312-726 | AT&T Midwest (Illinois Bell) | Landline |
| 312-727 | AT&T Midwest (Illinois Bell) | Landline |
| 312-728 | Verizon Wireless | Wireless |
| 312-729 | AT&T Midwest (Illinois Bell) | Landline |
| 312-730 | AT&T Local | Landline / VoIP |
| 312-731 | T-Mobile | Wireless |
| 312-732 | AT&T Midwest (Illinois Bell) | Landline |
| 312-733 | AT&T Midwest (Illinois Bell) | Landline |
| 312-734 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-735 | T-Mobile | Wireless |
| 312-736 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-737 | AT&T Midwest (Illinois Bell) | Landline |
| 312-738 | AT&T Midwest (Illinois Bell) | Landline |
| 312-739 | AT&T Midwest (Illinois Bell) | Landline |
| 312-740 | American Messaging (paging) | Wireless |
| 312-741 | Windstream (Paetec) | Landline / VoIP |
| 312-742 | AT&T Midwest (Illinois Bell) | Landline |
| 312-743 | AT&T Midwest (Illinois Bell) | Landline |
| 312-744 | AT&T Midwest (Illinois Bell) | Landline |
| 312-745 | AT&T Midwest (Illinois Bell) | Landline |
| 312-746 | AT&T Midwest (Illinois Bell) | Landline |
| 312-747 | AT&T Midwest (Illinois Bell) | Landline |
| 312-748 | Onvoy (Sinch) | Landline / VoIP |
| 312-749 | AT&T Mobility | Wireless |
| 312-750 | AT&T Midwest (Illinois Bell) | Landline |
| 312-751 | AT&T Midwest (Illinois Bell) | Landline |
| 312-752 | Lumen (Level 3) | Landline / VoIP |
| 312-753 | RCN (Astound) | Landline / VoIP |
| 312-754 | Lumen (Level 3) | Landline / VoIP |
| 312-755 | AT&T Midwest (Illinois Bell) | Landline |
| 312-756 | AT&T Midwest (Illinois Bell) | Landline |
| 312-757 | Bandwidth.com | Landline / VoIP |
| 312-758 | Verizon Wireless | Wireless |
| 312-759 | AT&T Midwest (Illinois Bell) | Landline |
| 312-760 | American Messaging (paging) | Wireless |
| 312-761 | Telengy | Landline / VoIP |
| 312-762 | AT&T Midwest (Illinois Bell) | Landline |
| 312-763 | Comcast (Xfinity Voice) | Landline / VoIP |
| 312-764 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-765 | AT&T Midwest (Illinois Bell) | Landline |
| 312-766 | Peerless Network | Landline / VoIP |
| 312-767 | Bandwidth.com | Landline / VoIP |
| 312-768 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-769 | Indiana Paging Network | Wireless |
| 312-770 | AT&T Midwest (Illinois Bell) | Landline |
| 312-771 | Verizon Wireless | Wireless |
| 312-772 | AT&T Mobility | Wireless |
| 312-773 | Onvoy Spectrum (Sinch) | Wireless |
| 312-774 | T-Mobile | Wireless |
| 312-775 | AT&T Midwest (Illinois Bell) | Landline |
| 312-776 | T-Mobile | Wireless |
| 312-777 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-778 | Onvoy (Sinch) | Landline / VoIP |
| 312-779 | Onvoy (Sinch) | Landline / VoIP |
| 312-780 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-781 | AT&T Midwest (Illinois Bell) | Landline |
| 312-782 | AT&T Midwest (Illinois Bell) | Landline |
| 312-783 | AT&T Mobility | Wireless |
| 312-784 | First Communications | Landline / VoIP |
| 312-785 | AT&T Mobility | Wireless |
| 312-786 | AT&T Midwest (Illinois Bell) | Landline |
| 312-787 | AT&T Midwest (Illinois Bell) | Landline |
| 312-788 | AT&T Midwest (Illinois Bell) | Landline |
| 312-789 | AT&T Midwest (Illinois Bell) | Landline |
| 312-790 | AT&T Midwest (Illinois Bell) | Landline |
| 312-791 | AT&T Midwest (Illinois Bell) | Landline |
| 312-792 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-793 | AT&T Midwest (Illinois Bell) | Landline |
| 312-794 | RCN (Astound) | Landline / VoIP |
| 312-795 | AT&T Midwest (Illinois Bell) | Landline |
| 312-796 | Peerless Network | Landline / VoIP |
| 312-797 | AT&T Midwest (Illinois Bell) | Landline |
| 312-798 | AT&T Midwest (Illinois Bell) | Landline |
| 312-799 | AT&T Midwest (Illinois Bell) | Landline |
| 312-800 | Peerless Network | Landline / VoIP |
| 312-801 | Nuso | Landline / VoIP |
| 312-802 | Verizon Wireless | Wireless |
| 312-803 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-804 | T-Mobile | Wireless |
| 312-805 | Verizon Wireless | Wireless |
| 312-806 | AT&T Mobility | Wireless |
| 312-807 | AT&T Midwest (Illinois Bell) | Landline |
| 312-808 | AT&T Midwest (Illinois Bell) | Landline |
| 312-809 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-810 | AT&T Mobility | Wireless |
| 312-812 | AT&T Midwest (Illinois Bell) | Landline |
| 312-813 | AT&T Mobility | Wireless |
| 312-814 | AT&T Midwest (Illinois Bell) | Landline |
| 312-815 | Airespring | Landline / VoIP |
| 312-816 | AT&T Mobility | Wireless |
| 312-817 | AT&T Midwest (Illinois Bell) | Landline |
| 312-818 | T-Mobile | Wireless |
| 312-819 | AT&T Midwest (Illinois Bell) | Landline |
| 312-820 | Onvoy (Sinch) | Landline / VoIP |
| 312-821 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-822 | AT&T Midwest (Illinois Bell) | Landline |
| 312-823 | AT&T Midwest (Illinois Bell) | Landline |
| 312-824 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-825 | T-Mobile | Wireless |
| 312-826 | T-Mobile | Wireless |
| 312-827 | AT&T Midwest (Illinois Bell) | Landline |
| 312-828 | AT&T Midwest (Illinois Bell) | Landline |
| 312-829 | AT&T Midwest (Illinois Bell) | Landline |
| 312-830 | Spok (paging) | Landline / VoIP |
| 312-831 | AT&T Midwest (Illinois Bell) | Landline |
| 312-832 | AT&T Midwest (Illinois Bell) | Landline |
| 312-833 | Verizon Wireless | Wireless |
| 312-834 | AT&T Midwest (Illinois Bell) | Landline |
| 312-835 | Verizon Wireless | Wireless |
| 312-836 | AT&T Midwest (Illinois Bell) | Landline |
| 312-837 | Comcast (Xfinity Voice) | Landline / VoIP |
| 312-838 | T-Mobile | Wireless |
| 312-839 | American Messaging (paging) | Wireless |
| 312-840 | AT&T Midwest (Illinois Bell) | Landline |
| 312-841 | AT&T Mobility | Wireless |
| 312-842 | AT&T Midwest (Illinois Bell) | Landline |
| 312-843 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-844 | AT&T Mobility | Wireless |
| 312-845 | AT&T Midwest (Illinois Bell) | Landline |
| 312-846 | AT&T Midwest (Illinois Bell) | Landline |
| 312-847 | Onvoy (Sinch) | Landline / VoIP |
| 312-848 | Verizon Wireless | Wireless |
| 312-849 | AT&T Midwest (Illinois Bell) | Landline |
| 312-850 | AT&T Midwest (Illinois Bell) | Landline |
| 312-851 | Spok (paging) | Landline / VoIP |
| 312-852 | AT&T Mobility | Wireless |
| 312-853 | AT&T Midwest (Illinois Bell) | Landline |
| 312-854 | RCN (Astound) | Landline / VoIP |
| 312-855 | AT&T Midwest (Illinois Bell) | Landline |
| 312-856 | AT&T Midwest (Illinois Bell) | Landline |
| 312-857 | AT&T Midwest (Illinois Bell) | Landline |
| 312-858 | Rclec | Landline / VoIP |
| 312-859 | Verizon Wireless | Wireless |
| 312-860 | AT&T Mobility | Wireless |
| 312-861 | AT&T Midwest (Illinois Bell) | Landline |
| 312-862 | AT&T Midwest (Illinois Bell) | Landline |
| 312-863 | Windstream (Paetec) | Landline / VoIP |
| 312-864 | AT&T Midwest (Illinois Bell) | Landline |
| 312-865 | AT&T Mobility | Wireless |
| 312-866 | T-Mobile | Wireless |
| 312-867 | AT&T Midwest (Illinois Bell) | Landline |
| 312-868 | Bandwidth.com | Landline / VoIP |
| 312-869 | AT&T Midwest (Illinois Bell) | Landline |
| 312-870 | First Communications | Landline / VoIP |
| 312-871 | T-Mobile | Wireless |
| 312-872 | Lumen (Level 3) | Landline / VoIP |
| 312-873 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-874 | T-Mobile | Wireless |
| 312-875 | AT&T Midwest (Illinois Bell) | Landline |
| 312-876 | AT&T Midwest (Illinois Bell) | Landline |
| 312-877 | AT&T Corp. | Landline / VoIP |
| 312-878 | Peerless Network | Landline / VoIP |
| 312-879 | AT&T Midwest (Illinois Bell) | Landline |
| 312-880 | AT&T Midwest (Illinois Bell) | Landline |
| 312-881 | Windstream (Paetec) | Landline / VoIP |
| 312-882 | Verizon Wireless | Wireless |
| 312-883 | Bandwidth.com | Landline / VoIP |
| 312-884 | Windstream (Paetec) | Landline / VoIP |
| 312-885 | T-Mobile | Wireless |
| 312-886 | AT&T Midwest (Illinois Bell) | Landline |
| 312-887 | AT&T Midwest (Illinois Bell) | Landline |
| 312-888 | AT&T Mobility | Wireless |
| 312-889 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-890 | Metro by T-Mobile (MetroPCS) | Landline / VoIP |
| 312-891 | Spok (paging) | Landline / VoIP |
| 312-892 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-893 | Lumen (Level 3) | Landline / VoIP |
| 312-894 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-895 | Lumen (Level 3) | Landline / VoIP |
| 312-896 | Lumen (Level 3) | Landline / VoIP |
| 312-897 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-898 | Verizon Wireless | Wireless |
| 312-899 | AT&T Midwest (Illinois Bell) | Landline |
| 312-900 | FracTEL | Landline / VoIP |
| 312-901 | Spok (paging) | Landline / VoIP |
| 312-902 | AT&T Midwest (Illinois Bell) | Landline |
| 312-903 | American Messaging (paging) | Wireless |
| 312-904 | AT&T Midwest (Illinois Bell) | Landline |
| 312-905 | AT&T Midwest (Illinois Bell) | Landline |
| 312-906 | AT&T Midwest (Illinois Bell) | Landline |
| 312-907 | T-Mobile | Wireless |
| 312-908 | AT&T Midwest (Illinois Bell) | Landline |
| 312-909 | Verizon Wireless | Wireless |
| 312-910 | Onvoy (Sinch) | Landline / VoIP |
| 312-912 | AT&T Midwest (Illinois Bell) | Landline |
| 312-913 | AT&T Midwest (Illinois Bell) | Landline |
| 312-914 | Verizon Wireless | Wireless |
| 312-915 | AT&T Midwest (Illinois Bell) | Landline |
| 312-917 | AT&T Midwest (Illinois Bell) | Landline |
| 312-918 | T-Mobile | Wireless |
| 312-919 | Verizon Wireless | Wireless |
| 312-920 | AT&T Midwest (Illinois Bell) | Landline |
| 312-921 | AT&T Midwest (Illinois Bell) | Landline |
| 312-922 | AT&T Midwest (Illinois Bell) | Landline |
| 312-923 | AT&T Midwest (Illinois Bell) | Landline |
| 312-924 | Windstream (Paetec) | Landline / VoIP |
| 312-925 | AT&T Mobility | Wireless |
| 312-926 | AT&T Midwest (Illinois Bell) | Landline |
| 312-927 | T-Mobile | Wireless |
| 312-928 | AT&T Midwest (Illinois Bell) | Landline |
| 312-929 | T-Mobile | Wireless |
| 312-930 | AT&T Midwest (Illinois Bell) | Landline |
| 312-931 | AT&T Midwest (Illinois Bell) | Landline |
| 312-932 | AT&T Midwest (Illinois Bell) | Landline |
| 312-933 | T-Mobile | Wireless |
| 312-934 | T-Mobile | Wireless |
| 312-935 | AT&T Midwest (Illinois Bell) | Landline |
| 312-936 | AT&T Midwest (Illinois Bell) | Landline |
| 312-937 | Verizon Wireless | Wireless |
| 312-938 | AT&T Midwest (Illinois Bell) | Landline |
| 312-939 | AT&T Midwest (Illinois Bell) | Landline |
| 312-940 | Peerless Network | Landline / VoIP |
| 312-941 | Spok (paging) | Landline / VoIP |
| 312-942 | AT&T Midwest (Illinois Bell) | Landline |
| 312-943 | AT&T Midwest (Illinois Bell) | Landline |
| 312-944 | AT&T Midwest (Illinois Bell) | Landline |
| 312-945 | AT&T Midwest (Illinois Bell) | Landline |
| 312-946 | AT&T Midwest (Illinois Bell) | Landline |
| 312-947 | AT&T Midwest (Illinois Bell) | Landline |
| 312-948 | Windstream (Paetec) | Landline / VoIP |
| 312-949 | AT&T Midwest (Illinois Bell) | Landline |
| 312-951 | AT&T Midwest (Illinois Bell) | Landline |
| 312-952 | AT&T Mobility | Wireless |
| 312-953 | AT&T Mobility | Wireless |
| 312-954 | AT&T Midwest (Illinois Bell) | Landline |
| 312-955 | RCN (Astound) | Landline / VoIP |
| 312-956 | AT&T Mobility | Wireless |
| 312-957 | AT&T Midwest (Illinois Bell) | Landline |
| 312-960 | AT&T Midwest (Illinois Bell) | Landline |
| 312-961 | AT&T Mobility | Wireless |
| 312-962 | Lumen (Level 3) | Landline / VoIP |
| 312-963 | Spok (paging) | Landline / VoIP |
| 312-964 | Onvoy (Sinch) | Landline / VoIP |
| 312-965 | Verizon Wireless | Wireless |
| 312-966 | Metro by T-Mobile (MetroPCS) | Landline / VoIP |
| 312-967 | Bandwidth.com | Landline / VoIP |
| 312-968 | Verizon Wireless | Wireless |
| 312-969 | Verizon Wireless | Wireless |
| 312-970 | AT&T Midwest (Illinois Bell) | Landline |
| 312-971 | Bandwidth.com | Landline / VoIP |
| 312-972 | AT&T Mobility | Wireless |
| 312-973 | Verizon Business (MCImetro) | Landline / VoIP |
| 312-974 | AT&T Midwest (Illinois Bell) | Landline |
| 312-975 | T-Mobile | Wireless |
| 312-977 | AT&T Midwest (Illinois Bell) | Landline |
| 312-978 | T-Mobile | Wireless |
| 312-979 | AT&T Midwest (Illinois Bell) | Landline |
| 312-980 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-981 | Windstream (Paetec) | Landline / VoIP |
| 312-982 | Comcast (Xfinity Voice) | Landline / VoIP |
| 312-983 | AT&T Midwest (Illinois Bell) | Landline |
| 312-984 | AT&T Midwest (Illinois Bell) | Landline |
| 312-985 | Windstream (Paetec) | Landline / VoIP |
| 312-986 | AT&T Midwest (Illinois Bell) | Landline |
| 312-987 | AT&T Midwest (Illinois Bell) | Landline |
| 312-988 | AT&T Midwest (Illinois Bell) | Landline |
| 312-989 | AT&T Mobility | Wireless |
| 312-990 | AT&T Mobility | Wireless |
| 312-991 | AT&T Mobility | Wireless |
| 312-992 | AT&T Midwest (Illinois Bell) | Landline |
| 312-993 | AT&T Midwest (Illinois Bell) | Landline |
| 312-994 | Windstream (Paetec) | Landline / VoIP |
| 312-995 | AT&T (Teleport Communications) | Landline / VoIP |
| 312-996 | AT&T Midwest (Illinois Bell) | Landline |
| 312-997 | AT&T Midwest (Illinois Bell) | Landline |
| 312-998 | Lumen (CenturyLink) | Landline / VoIP |
| 312-999 | Verizon Business (MCImetro) | Landline / VoIP |
Line type reflects the registry assignment; ported numbers can differ. Unknown 312 number calling? ActiveArmor® screens it before you ever look it up.
Cities & Communities in and around Area Code 312
Communities the 312 serves, filtered against the numbering registry’s rate centers, with each community’s key ZIP codes and the AT&T home internet available there. Cities link to their local AT&T internet page.
| City / community | Key ZIP codes | AT&T internet |
|---|---|---|
| Bedford Park | 60638, 60459, 60455 | Fiber up to 5 GIG |
| Chicago | 60608, 60623, 60609 | Fiber up to 5 GIG |
| Cicero | 60804, 60402, 60623 | Internet Air |
| Elmwood Park | 60707, 60171, 60634 | Fiber up to 5 GIG |
| Evanston | 60201, 60203, 60202 | Fiber up to 5 GIG |
| Lincolnwood | 60712, 60646, 60659 | Fiber up to 5 GIG |
| Oak Park | 60301, 60302, 60304 | Fiber up to 5 GIG |
City list: AT&T service-area records and the public numbering registry. Key ZIPs: U.S. Census data for each community. Internet type: AT&T eligibility data, June 2026. Availability is always confirmed at your exact address.
312 Area Code Map
Area code 312 covers downtown Chicago inside the 773 ring, overlaid by 872. The shaded core is centered on the Loop.
↓ Printable PDF
Open the printable 312 map (PDF) · All Illinois area codes · Home internet in Chicago
Counties Covered by the 312 Area Code
Counties are served in whole or in part; population is U.S. Census Bureau ACS 2023.
The 312, explained
Area Code 312: More Than a Number in Chicago
In Chicago, the 312 is more than digits on a caller ID. It’s one of the original area codes of 1947, and it has meant downtown Chicago ever since — 785 carrier prefixes keep its lines busy today, and an established 312 number still says you’ve been here a while.
The map tells its own story: downtown Chicago, with 872 sharing the same streets today. Several codes, one local calling area, no long-distance between any of them — only the 312 came first.
Keeping a 312 matters here. An existing 312 number ports to a new phone, a new carrier, or a new AT&T line, and stays yours anywhere in the U.S. New lines in the area often draw 872 instead — one more reason locals hold on to theirs.
Need a new local number? Shop plans Keep your 312: bring it to AT&TInternet, wireless & stores in the 312
AT&T Home Internet in Area Code 312
AT&T home internet serves communities across area code 312, with AT&T Fiber where it’s built and AT&T Internet Air covering the gaps. Availability is decided address by address; every community in the table above links to its local internet page.
No data capsNo annual contractNo equipment fees
AT&T Fiber: Ltd. avail/areas. Speeds based on wired connection. Actual speeds vary. For 5-GIG, single device wired speed maximum 4.7Gbps. For more info., visit att.com/speed101. AT&T Internet Air: AT&T Internet Air not available in all areas. In rare cases, if your usage is contributing to congestion on the network, AT&T will greatly reduce your speed for a minimum of 30 min.
Pair it with wireless in an internet + wireless bundle. Run a business in the 312? AT&T Business Internet is available at many addresses.
Fiber install day in the 312Check your address ›
Moving to Area Code 312?
Set up home internet in area code 312 before the boxes arrive, and find your new community in the table above or check your exact address below.
Your number moves with you: port your 312 number from anywhere, or keep your old number when you arrive. An AT&T store nearby can handle the whole switch in one visit.
1 · Check your addressSee Fiber or Internet Air availability in seconds.
2 · Schedule for move-in dayInstall lined up before the boxes arrive.
3 · Keep your numberYour mobile number ports; your internet moves.
Get set up before move-in dayPlan your move ›
AT&T Wireless in Area Code 312
AT&T’s 5G network covers most of area code 312. ActiveArmor® spam blocking is included with every unlimited plan, your 312 number stays yours, and great cell phone deals in Chicago are a tap away.
5G across the 312ActiveArmor® includedKeep your 312 number
AT&T may temporarily slow data speeds if the network is busy. 5G req’s compatible plan & device. Coverage not available everywhere. Learn more at att.com/5Gforyou.
Need a new 312 number? Ask when you activate a line: the 312 shares its territory with 872, so new lines may draw one of those codes, and porting an existing 312 number keeps it yours.
Stay connected across ChicagoShop wireless plans ›
AT&T Stores in Area Code 312
Looking for cell phone stores in area code 312? These stores answer on 312 numbers — walk in for switching, porting, upgrades and hands-on help:
Every AT&T store in the region, company owned and authorized retailer alike, each with its own store page.
Real help from real people in ChicagoFind your store ›
All AT&T Stores with 312 Numbers
Every store below answers on a 312 number. Tap any number to call.
4 AT&T stores with 312 numbers
International Calling from Area Code 312
Calling abroad from area code 312? AT&T International Calling adds discounted or unlimited rates to 200+ countries on top of your existing plan, and unlimited texting from the U.S. to 200+ destinations is already included on AT&T unlimited plans.
Where the 312 calls most:MexicoPolandIndiaPhilippinesChinaSouth Korea
Top places of birth among foreign-born residents of the 312’s counties, U.S. Census Bureau ACS 2023.
Calling abroad from a 312 number: dial 011 + country code + number (or just + on a mobile). Traveling abroad instead? International Day Pass® takes your talk, text and data with you for a flat daily rate.
International Calling and International Day Pass® availability, rates and included destinations vary by plan; see att.com for the current country list.
Chicago calls the worldSee international plans ›
312 Area Code Quick Facts & Dialing
StateIllinois
Time zoneCentralUTC-6 / UTC-5
Overlays872share this territory
Established1947original code
Dialing10 digitsrequired
Toll-free?Nogeographic code
Population5.28Mcounties served, Census 2023
How to dial a 312 number
| Scenario | Format | Example |
|---|---|---|
| Local call (within the region) | 312 + 7-digit number | (312) 555-0100 |
| Long distance (within the U.S.) | 1 + 312 + 7-digit number | 1 (312) 555-0100 |
| Calling 312 from another country | +1 312 + 7-digit number | +1 312 555 0100 |
| From a mobile phone | (312) + 7-digit number | (312) 555-0100 |
A Short History of Area Code 312
One of the original area codes of 1947, the 312 has served downtown Chicago from the beginning.
1947Assigned as one of the original 86 codes
1989Territory split off as 708
1996Territory split off as 773
2009First overlay: 872
Area Code 312 vs the related codes
| Code | Added | Type | Where it works |
|---|---|---|---|
| 312 | 1947 | Original | downtown Chicago |
| 708 | 1989 | Split | Territory carved from the 312 |
| 773 | 1996 | Split | Territory carved from the 312 |
| 872 | 2009 | Overlay | Same territory as the 312 |
Same rates, same local dialing: a number from any code in the region works exactly like a 312.
Nearby & Related Area Codes
Browse area codes by state: Illinois (17) · California (41) · Texas (29) · Florida (23) · all 50 states ›
Area Code 312 FAQ
What area code is 312?
312 is the area code for Chicago, Illinois and the surrounding communities. It appears at the front of every local 10-digit phone number in the area.
Where is area code 312?
Area code 312 serves Chicago, Illinois and nearby communities including Algonquin, Arlington Heights, Aurora. The full city list is in the cities table above.
Why did I get a text message from a 312 number?
The most common 312 text scam opens like a wrong number (“u at home?”, “are you busy tomorrow?”) and tries to move you to WhatsApp. Don’t reply. Forward the text to 7726 (SPAM) and delete it. AT&T ActiveArmor® filters known scam senders automatically.
Who called me from area code 312?
A 312 number usually means Chicago or a nearby community, but spoofing is common. This page’s prefix lookup isn’t a reverse phone lookup — it can’t name the caller, but it shows the carrier, line type and community a number was issued to, which is often enough to judge a call.
What time zone is area code 312?
Central time. The live local time is shown at the top of this page.
Why am I getting calls from 312 numbers?
312 is an active, legitimate Illinois area code, but scammers spoof local numbers because people answer them. If there’s no voicemail, let it go. AT&T ActiveArmor® blocks and labels spam automatically, and you can report unwanted calls at reportfraud.ftc.gov. The spam report board above shows which 312 prefixes are drawing complaints right now.
Is 312 a toll-free number?
No. 312 is a geographic area code tied to Chicago, Illinois. Toll-free calls come from 800, 833, 844, 855, 866, 877 and 888 numbers.
When was area code 312 created?
Area code 312 entered service in 1947 and still covers Chicago and the surrounding Illinois communities today. The full timeline is in the history section above.
Which cities use area code 312?
The largest communities include Bedford Park, Chicago, Cicero, Elmwood Park, Evanston. The full list is in the cities table above.
Does AT&T offer service in the 312?
Yes: home internet, wireless and retail stores across the 312. Availability is checked address by address.
Can I still get a 312 number?
Yes. Carriers in Chicago and across the 312 still issue 312 numbers on new lines, and you can port an existing 312 number to any carrier.
Can I keep my 312 number if I move?
Yes. Phone numbers are portable: your 312 number can move with you anywhere in the U.S., whether you stay with your carrier or switch.
Sources: city and store data from AT&T records; prefix and carrier assignments from the public numbering registry (pulled July 2026). Facts regenerate monthly.
