406 area code: location, time zone and numbers
In Montana, 406 has served as a US telephone area code since 1947.
- Location
- Every part of Montana
- Service active since
- 1947
- Time zone used
- The area uses Mountain time
- Overlay
- No overlay exists: this is the only code serving the area
- Calls made locally
- Full 10-digit dialling
- Rate centre locations
- 260
- Projected exhaustion
- 2033
- Country calling code
- +1 (United States)
The source is NANPA public reports: the area code report and the rate-centre report, dated 11/01/2026. The NANPA projections 2026-1 (April 2026) provide the exhaust year. We are not an official NANPA website.
Get a 406 phone number
A 406 number is available through two routes. When you sign up, a provider assigns a new number from those it holds in the code as part of its plan. A seller offers numbers from its current stock, often with a pattern, at a one-time price. You then move your chosen number to a provider.
First-year cost ranking for providers
| Provider | Cheapest plan | First year | Link |
|---|---|---|---|
 Free app | Basic (Just for me), free | $0 | Open Google Voice |
 Free app | Free plan, free | $0 | Open TextNow |
 Developer API | Pay-as-you-go local number, $1.15 a month | $13.80 | Open Twilio |
 Second-number app | Standard, $3.99 a month billed yearly | $47.99 | Open Burner |
 Toll-free specialist | Solo, $6.99 a month billed yearly | $84 | Open UniTel Voice |
 Second-number app | Deluxe (local number), $6.99 a month billed yearly | $102.88 | Open GoDaddy Conversations (formerly Smartline) |
Sellers listing local numbers
| Seller | What it sells | Listed price | Monthly fee | Link |
|---|---|---|---|---|
 Marketplace | Local numbers | From $9 one-time | None stated | Search at Exclusive Digits |
 Marketplace | Local and toll-free | From $9.95 one-time | $2.99 a month | Search at NumberBarn |
 Number broker | Local and toll-free | From $99 one-time | None stated | Search at RingBoost |
 Number broker | Local and toll-free | From $100 one-time | None stated | Search at PhoneNumberExpert |
| 212areacode.comNumber broker | Local numbers | From $150 one-time | None stated | Search at 212areacode.com |
Some sellers and providers may pay us a referral fee. The order stays based on first-year cost. How we earn
Places in the 406 area code
For 406, NANPA lists 260 rate centres. Each one is a local calling area where numbers are assigned:
Dillon, Devon, Denton, Deer Lodge, Decker, Darby, Dagmar, Cut Bank, Custer, Culbertson, Crooked Creek, Cooke City, Conrad, Condon, Columbus, Columbia Falls, Colstrip, Clyde Park, Clinton, Circle, Choteau, Chinook, Chester, Charlo, Cascade, Carter, Carlyle, Canyon Creek, Butte, Busby, Browning, Brockton, Broadview, Broadus, Bridger, Brady, Bozeman, Box Elder, Boulder, Bloomfield, Birney, Billings, Bigfork, Big Timber, Big Sky, Big Sandy, Belt, Belgrade, Belfry, Baker, Bainville, Avon, Augusta, Ashland, Arlee, Anaconda, Alzada, Alta, Alberton, Absarokee and 200 additional locations.
406 area code questions
Which area does 406 cover?
Montana is where the 406 area code rings.
What country code belongs to a 406 number?
+1. Because 406 belongs to the North American Numbering Plan, callers abroad dial +1 406 followed by the 7-digit number.
What time is it in the 406 area code?
Mountain time applies throughout 406.
Who calls with a 406 number?
People with numbers in this code include homes, mobiles, local businesses and callers who fake a local number. The 406 number shown on your screen tells you where it was assigned, but not who is calling.