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Montana · Mountain Time Updated July 2026

Area Codes in Montana

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

Montana has 1 active area code. 406 is Billings 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 Montana city is covered below. Find your city ›
Area codes1
Original406 · 1947
Largest metroBillings
Local time12:40 AM MT
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.

→

All 1 Montana Area Code

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

406Alberton, Arlee, Belgrade754 prefixes in serviceArea code 406 guide ›
Got a call from a Montana 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

Montana Area Codes by City

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

CityArea code(s)
Billings406
Great Falls406
Missoula406
Bozeman406
Helena406
Kalispell406

How Montana Got Its Codes

Every Montana 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
1947406One of the original area codes of 1947

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

Montana Area Code Map

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

Map of Montana area codes with anchor cities↓  Printable PDF

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

AT&T IN GEORGIA

Internet, wireless & stores across the state

All AT&T services in Montana Home internet in Montana Wireless plans AT&T stores in Montana

AT&T Home Internet in Montana

AT&T home internet is available across Montana, 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 Montana ›

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

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

AT&T Wireless in Montana

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

5G across MontanaActiveArmor® 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 Montana ›

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

AT&T Stores Across Montana

From the Billings metro to Butte, Great Falls 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: Billings · Butte · Great Falls · Bozeman · Missoula

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

Area Codes in Neighboring States

North Dakota area codesSouth Dakota area codesWyoming area codesIdaho area codesAll 50 states ›

Montana Area Code FAQ

How many area codes does Montana have?
Montana has 1 active area code: 406. Each links to a full guide above.
Which Montana 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 Montana 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 Montana in?
Montana is primarily on Mountain time. The live local time is shown at the top of this page.
Does AT&T offer service in Montana?
Yes — home internet, wireless and retail stores across Montana. 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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