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US area code · Montana

Area code 406

Where the 406 area code is, its overlay and how to dial a +1 406 number from anywhere.

CoversBillings, MontanaTime zoneMountain (MT)TypeGeographic
Quick answer

The 406 area code is in Billings, Montana, United States (Mountain (MT)). To call from abroad: +1 406 555-0123.

StateMontana
Main areaBillings
Time zoneMountain (MT)
TypeGeographic
10-digit dialingRequired
In service since01-Jan-1947

The 406 area code is a geographic North American Numbering Plan (NANP) code covering Billings, Montana. It has been in service since 01-Jan-1947 and sits in the Mountain (MT) time zone.

How to dial a 406 number

From abroad+1 406 555-0123
Within the US / Canada1 406 555-0123
Locally (same area)406 555-0123

Cities in the 406 area code

A 406 number is usually in one of these places in Montana — 6 counties.

Billings YellowstoneBozeman GallatinButte Silver BowGreat Falls CascadeHelena Lewis And ClarkMissoula Missoula

Frequently asked questions

Where is the 406 area code?

The 406 area code is in Billings, Montana, United States (Mountain (MT)).

Do I have to dial 10 digits for 406?

Yes — dial the area code plus the seven-digit number.

How do I call a 406 number from another country?

Dial your exit code (or +), then 1, then 406, then the number: +1 406 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 406 number does not pinpoint a street or ZIP code.

Missed a call from +1 406?

In the 30 days to September 24, 2026, 546 unwanted calls showing a 406 number were reported to the US Federal Trade Commission, 61% of them recorded messages or robocalls. That puts 406 at #161 of 670 area codes reported.

Other301
Reducing your debt (credit cards, mortgage, student loans)65
Dropped call or no message47
Calls pretending to be government, businesses, or family and friends42
Before you call back
  • If you do not know anyone in Montana, do not call back: a genuine caller will leave a message or send a text.
  • Scammers fake the number shown on caller ID, so a 406 number can hide a caller anywhere in the world.
  • Never give a code received by text or a bank detail to an unknown caller. In the US, calls can be reported at reportfraud.ftc.gov.

Who issues +1 406 numbers

Phone companies hold blocks of numbers in each area code. The main holders in 406:

Qwest Corporation 132Cellco Partnership Dba Verizon Wireless 119New Cingular Wireless PCS, LLC 74Onvoy, LLC 43Triangle Tel. Coop. Assn., Inc. 39Nemont Tel Coop Inc 33

About 26.3% of the 768 prefixes in use belong to mobile carriers: a 406 number is often a cell phone, and it may have moved to another carrier since.

Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.

All US area codes United States +1 Map of area code 406 — cities & rate centres