Area Code Box

Area code 406

Where is area code 406?

Billings, Missoula and Great Falls, Montana

Local time: … (Mountain Time)

StateMontana
CountryUnited States
Main citiesBillings, Missoula and Great Falls
Time zoneMountain Time
Overlay area codesNone
In service since1947
Assigned prefixes754
Dialing format(406) XXX-XXXX · +1 406 XXX XXXX from abroad

Look up a 406 number

Enter a 3-digit area code or a full 10-digit number.

Cities and towns in area code 406

Listed by how many phone prefixes (the 3 digits after the area code) are assigned to each place in 406.

Phone companies in area code 406

The carriers that hold the most 406 prefixes. People can move their number to another carrier, so this shows who first issued a number, not who serves it today.

PrefixesCarrier
132Qwest (Lumen)
119Verizon Wireless
74New Cingular Wireless PCS (AT&T)
43Onvoy
39Triangle Tel. Coop. Assn.
33Nemont Tel Coop
27Level 3 Communications
27Mid-Rivers Tel. Coop.

All 754 prefixes in area code 406

Pick the 3 digits after the area code to see that prefix’s city and carrier.

Questions

Where is area code 406?
Area code 406 is in Montana. It serves Billings, Missoula, Great Falls, Helena and Bozeman and 256 other cities and towns.
What time zone is area code 406 in?
Area code 406 uses Mountain Time.
Is a call from area code 406 a scam?
The area code alone doesn’t tell you. Most calls from 406 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 406 number, let it go to voicemail.
When did area code 406 start?
406 went into service in 1947.
Can a 406 number be outside Montana?
Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 406 caller can be anywhere.