Every US area code, explainedUnited States · +1
Area Code Contact ES
Menu
AREA CODE · MONTANA

Area code 406

Area code 406 covers Billings, Montana. Map, time zone, overlays, carriers, the full list of prefixes and how to dial it.

State: Montana Major City: Billings Mountain Time (MT) Overlay: None
01 / WHERE IT IS

Where is area code 406?

Area code 406 is assigned to Billings and the surrounding region in Montana. Calls to numbers that start with 406 are routed to this area.

Area code 406 is not currently part of an overlay: it serves its territory on its own.

Counties covered

Yellowstone CountyMissoula CountyGallatin CountyFlathead CountyLewis and Clark CountyCascade CountyLake CountySilver Bow CountyCarbon CountyRosebud CountyHill CountyPark CountyValley County

Line types

  • Mobile 29.35%
  • Landline 70.65%
02 / MAP

Area code 406 on the map

The shaded area joins the code’s numbering centers; the marker shows its main city.

Loading…

© OpenStreetMap contributors

03 / LOCAL TIME

Current time in Billings

This area code is in the Mountain Time (MT) time zone.

Local timeBillings, MT--:--:--

Loading…

America/DenverLive
04 / HOW TO DIAL

How to call Billings

WITHIN THE US406 XXX XXXX

Always 10 digits — landline, mobile or VoIP. Local, long distance or a different state: the format is always the same. You do not need to dial the 1 first.

FROM ABROAD+1 406 XXX XXXX

Exit codes: 00 Europe/Mexico · 011 Canada · 010 Japan · + universal

WHATSAPP / IMESSAGE+1 406 XXX XXXX

Always save the number in international format so messaging apps recognize it correctly:

Call typeTraditional landlineMobile / VoIP
Local (same area code)10 digits10 digits
US long distance1 + 10 digits10 digits
Emergency911911
🌐Universal+1 406 555 0123
🇪🇸🇲🇽Spain / Mexico00 1 406 555 0123
🇦🇺Australia0011 1 406 555 0123
🇯🇵Japan010 1 406 555 0123
HAVE THE FULL NUMBER?

Learn more about that number.

Check the line type and the carrier the number block was originally assigned to.

10 digits to see the carrier and line type of the number

05 / CARRIERS

Carriers in area code 406

Share of the number blocks by carrier and line type.

Landline

Lumen Technologies
35%
Sinch
8%
TRIANGLE TEL. COOP. ASSN.
7%
NEMONT TEL COOP INC
6%
MID-RIVERS TEL. COOP.
5%
Others
39%

Mobile

Verizon Wireless
54%
AT&T Mobility
33%
BLACKFOOT COMMUNICATIONS
4%
T-MOBILE USA
3%
SAGEBRUSH CELLULAR
3%
Others
3%

Carrier shown is the original assignment of each number block and may differ today because of number portability.

06 / PREFIXES

Complete list of prefixes for area code 406

753 number blocks (NXX) assigned in this area code.

PrefixTypeCityCarrier
(406) 200 Landline Billings AT&TTELEPORT COMMUNICATIONS AMERICA MT - LLC
(406) 201 Mobile Forsyth AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC
(406) 202 Mobile Helena AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC
(406) 203 Landline Missoula Lumen TechnologiesLEVEL 3 COMMUNICATIONS, LLC - MT
(406) 204 Landline Helena Lumen TechnologiesLEVEL 3 COMMUNICATIONS, LLC - MT
(406) 205 Landline Great Falls Lumen TechnologiesLEVEL 3 COMMUNICATIONS, LLC - MT
(406) 206 Landline Billings Lumen TechnologiesLEVEL 3 COMMUNICATIONS, LLC - MT
(406) 207 Mobile Missoula AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC
(406) 208 Mobile Billings AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC
(406) 209 Mobile Bozeman AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC

Showing 10 of 753 prefixes

07 / FAQ

Frequently asked questions about area code 406

Where is area code 406 used?
Area code 406 serves Billings and the surrounding area in Montana, including Yellowstone County, Missoula County, Gallatin County, Flathead County, Lewis and Clark County.
What city is area code 406 from?
The main city of area code 406 is Billings, MT.
What time zone is area code 406 in?
Area code 406 is in the Mountain Time (MT) time zone (America/Denver).
Is 406 an overlay area code?
No. Area code 406 is not currently part of an overlay.
How do I call a number with area code 406 from the United States?
Dial the 10 digits: 406 + 7-digit number. For some long-distance calls from a landline you may need to add a 1 first.
How do I call a 406 number from another country?
Dial your country's exit code (or +), then 1, then 406 and the seven-digit number. From a mobile you can use +1 406 XXX XXXX.
Which carriers use area code 406?
Most landline blocks belong to Lumen Technologies and most mobile blocks to Verizon Wireless. The carrier shown is the original assignment and may differ today because of number portability.
Is area code 406 for landlines, mobiles or both?
Both. About 70.65% of the number blocks are landline, 29.35% mobile.
How do I save a 406 number in WhatsApp or my phone?
Save it in international format: +1 406 XXX XXXX. That way WhatsApp, iMessage and Telegram recognize it from any country.
Is it safe to answer calls from area code 406?
The area code only shows the region a number was assigned to; it does not tell you who is calling. Scammers can fake any area code, so do not share personal or banking information with unknown callers, and let unknown numbers go to voicemail.
KEEP EXPLORING

Nearby area codes

986Boise, ID208Boise, ID307Cheyenne, WY509Spokane, WA385Salt Lake City, UT801Salt Lake City, UT