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South Dakota · Central Time Updated July 2026

Area Codes in South Dakota

10 codes, from a 1947 original to 2022’s newest, and an 11th on the way

South Dakota has 1 active area code. 605 is Sioux Falls and its surroundings. Tap any code below for its full guide: who called, cities and ZIP codes, the coverage map and the live local time.

Not sure which code is yours? Every South Dakota city is covered below. Find your city ›
Area codes1
Original605 · 1947
Largest metroSioux Falls
Local time— CT
Who called me?

Look up a 404 number, carrier info and spam patterns.

→Is this a scam?

Verdict, current patterns, and free blocking.

→Cities & ZIP codes

Every city in the 404, with ZIPs and internet type.

→Coverage map

Exactly where area code 404 reaches.

→Get a 404 number

New lines, porting, keeping your number.

→Home internet

Check what’s available at your address.

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All 1 South Dakota Area Code

Every active code: tap any card for its full guide, who called, cities and ZIPs, map, spam patterns and local time.

605Aberdeen, Alcester, Aurora744 prefixes in serviceArea code 605 guide ›
Got a call from a South Dakota number you don’t recognize? Open that code’s guide above for its full prefix lookup. AT&T ActiveArmor® blocks spam automatically, 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 how ActiveArmor works

South Dakota Area Codes by City

The largest South Dakota communities and the area code that serve them. Every city links to its local AT&T internet page.

CityArea code(s)
Sioux Falls605
Aberdeen605
Brookings605
Huron605
Mitchell605
Pierre605
Rapid City605
Spearfish605
Watertown605
Yankton605

How South Dakota Got Its Codes

Every South Dakota area code, in the order it entered service. Splits carved new regions; added codes overlay existing ones, which is why ten-digit dialing is standard.

In serviceCodeHow it arrived
1947605One of the original area codes of 1947

Source: NANPA NPA database, July 2026. Regenerated monthly.

South Dakota Area Code Map

Every active South Dakota area code at a glance, anchored to the metro each one serves. Tap any code above for its detailed coverage map.

Map of South Dakota area codes with anchor cities↓  Printable PDF

Open the printable South Dakota area code map (PDF) — poster format with a QR code back to this page.

AT&T Home Internet in South Dakota

AT&T home internet is available across South Dakota, checked address by address; every area code guide above lists its cities and what’s offered there.

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.

Check availability at your addressAll AT&T services in South Dakota ›

Start with home internet in South Dakota, or pair it with wireless in an internet + wireless bundle.

Family streaming together on AT&T home internet
Home internet across South DakotaCheck your address ›

AT&T Wireless in South Dakota

AT&T’s 5G network covers most of South Dakota. ActiveArmor® spam blocking is included with every unlimited plan, your number stays yours when you move between South Dakota codes, and great cell phone deals in South Dakota are a tap away.

5G across South DakotaActiveArmor® includedKeep your 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.

Shop wireless plansBring your number ›

See the AT&T wireless coverage map for South Dakota ›

Woman smiling at her phone on a downtown street
Stay connected across South DakotaShop wireless plans ›

AT&T Stores Across South Dakota

From the Sioux Falls metro to Mitchell, Aberdeen and beyond, walk in for switching, porting, upgrades and hands-on help. Every area code guide lists its nearest stores.

Find your nearest AT&T store

Find stores in: Sioux Falls · Mitchell · Aberdeen · Huron · Brookings

AT&T store employee helping a customer with her phone
Real help from real people across South DakotaFind a store ›

Area Codes in Neighboring States

North Dakota area codesMinnesota area codesIowa area codesNebraska area codesWyoming area codesMontana area codesAll 50 states ›

South Dakota Area Code FAQ

How many area codes does South Dakota have?
South Dakota has 1 active area code: 605. Each links to a full guide above.
Which South Dakota area code is mine?
Tap any code above to see the communities it serves; each guide lists cities with ZIP codes and a coverage map.
Who called me from a South Dakota number?
Open that code's guide and check the prefix lookup: every assigned prefix with its carrier. No voicemail? Let it go — legitimate callers leave messages.
What time zone is South Dakota in?
South Dakota is primarily on Central time. The live local time is shown at the top of this page.
Does AT&T offer service in South Dakota?
Yes — home internet, wireless and retail stores across South Dakota. Availability is checked address by address.
Sources: prefix and carrier assignments from the NANPA central-office code registry; population figures from the U.S. Census Bureau; spam-pattern indicators from FTC Do Not Call filings and AT&T ActiveArmor® network telemetry. Facts are rebuilt from these sources at build time; the page regenerates monthly.
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