The 406 area code covers the entire state of Montana. It ranks among the original 86 area codes that officials created in 1947. Montana still uses as its only area code, a rare distinction shared by only a handful of U.S. states. People across the United States dial 406 numbers as 1-406-XXX-XXXX. The area code operates in the Mountain Time Zone.
What Is the 406 Area Code?
Area code 406 is the telephone area code assigned to the entire state of Montana under the North American Numbering Plan. Unlike most states, which have been split into multiple area codes as population and phone-number demand grew, Montana has kept a single area code since the nationwide numbering system was created in 1947.
Where Does the 406 Area Code Cover?
The area code 406 location​ covers all of Montana, every county, from the largest cities to the smallest rural communities. There are no overlays and no regional splits; a single numbering plan area blankets the whole state.
Major cities served by the 406 area code
Major cities served by the location of area code 406​ include:
History of the 406 Area Code
406 area code us​ in 1947 as one of the original areas codes under its first nationwide telephone numbering plan. At that time, AT&T used the middle digit of an area code, 0 or 1, to indicate whether the code covered an entire state or only part of it. The 0 indicated statewide coverage, so AT&T designed 406 to serve all of Montana from the beginning.
Is the 406 Area Code Going Away?
Not yet, but it isn’t guaranteed to last forever. Montana’s Public Service Commission (PSC) has warned that the state could exhaust its supply of new 406 numbers by early 2033. The shortage isn’t about running out of phone numbers in general; Montana has plenty of unused ten-digit numbers. The real bottleneck is the limited supply of central office codes (NXX codes), the three digits that come right after the area code, which telecom carriers need in order to issue new blocks of numbers.
What Time Zone Is the Area Code In?
The entire area code is 406​ operates in the Mountain Time Zone (MT), observing daylight saving time along with the rest of the state.
How to Get a Area Code Number
You don’t have to live in Montana to get a 406 phone area code​. Options include:
Area Code Scam Awareness
As with any area code, scammers sometimes spoof numbers to appear local and trustworthy. If you receive an unexpected call from a 406 number asking for personal information, payment, or gift cards, treat it with the same caution you would any unknown call:
406 Area Code at a Glance
| Detail | Information |
|---|---|
| State covered | Montana (entire state) |
| Year established | 1947 |
| Time zone | Mountain Time (MT) |
| Overlay/split | None — single area code statewide |
| Major cities | Billings, Missoula, Great Falls, Bozeman, Helena, Butte, Kalispell |
| Projected exhaustion | Early 2033 (per NANPA projections) |
| Dialing format | 1-406-XXX-XXXX |
Frequently Asked Question(FAQs)
Conclusion
The 406 area code usa​ is more than a set of digits; it’s Montana’s only area code, a distinction it has held since 1947 and one that has become woven into the state’s sense of identity. Whether you’re trying to identify where a call is coming from, looking to get a Montana-based number for business or personal reasons, or just curious about the numbering system, the key facts are simple: 406 covers the entire state, sits in the Mountain Time Zone, and has no overlays or splits.