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Area code 406

Area code 406 Billings, Montana

Area code 406 is one of the original 1947 area codes, in Montana, with numbers assigned in Billings, Missoula, Helena and 210 more places. It’s 10:13 PM there now.

State
MontanaThe only area code in Montana
Time zone
Mountain10:13 PM there now
Exchanges
754213 places
Overlay
NoneThe only code for its area
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Where area code 406 is

Numbers in 406 are assigned to 213 places in 56 counties: Yellowstone County, Missoula County, Gallatin County, Flathead County, Lewis and Clark County, Cascade County, plus 50 more.

No single place dominates: Billings, the largest, has 10% of the exchanges.

  • Billings72
  • Missoula47
  • Helena38
  • Great Falls37
  • Bozeman32
  • Kalispell25
  • Butte-Silver Bow17
  • Miles City10
  • Sidney9
  • Livingston8
  • Lewistown8
  • Hamilton8
  • Havre7
  • Shelby7
  • Dillon7
  • Hardin7
  • Libby6
  • Columbus6
  • Glendive6
  • Red Lodge6
  • Laurel6
  • Forsyth5
  • Colstrip5
  • Conrad5

Phone companies in 406

754 blocks of numbers in 406 are held by 60 phone companies. The most belong to Lumen (CenturyLink) (158), Verizon Wireless (119) and AT&T Mobility (74).

Mostly landline: about 53% of blocks belong to local phone and cable companies, 28% to wireless networks and 20% to other carriers.

A block’s holder is the company it was first assigned to; numbers can move to other carriers since.

History and overlays

406 has been in service since 1947, when the first North American area codes were set up.

25 new exchanges were assigned since 2021, the latest in June 2026.

Calling 406

It’s 10:13 PM Mountain time in 406 right now.

From elsewhere in the U.S., dial 1, 406 and the 7-digit number.

Nearby area codes

406 is Montana’s only area code.

From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.

Map of the 406 area code

Map of the 406 area code around Billings, Missoula and Helena, Montana.

Interactive map © OpenStreetMap contributors

Cities on the map

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Questions about 406

Where is area code 406?

In Montana, covering Billings, Missoula and Helena and other places across 56 counties.

What time zone is 406 in?

Mountain time. It was 10:13 PM there when this page loaded.

Is 406 an overlay?

No. 406 is the only area code for its area right now.

Which phone companies have 406 numbers?

60 companies hold blocks; the most belong to Lumen (CenturyLink), Verizon Wireless and AT&T Mobility. About 28% of blocks are wireless.

Is 406 running out of numbers?

Not on record. 25 new exchanges have been assigned since 2021.