Billings Montana Area Code
One area code covers Billings: 406.
The code covering Billings
| Area code | Primarily serves | In service |
|---|---|---|
| 406 | Billings | 1947 |
Scope the codes matched to Billings. Source geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot) and LocalCallingGuide NPA list (2026-07 NPA list). Updated . Overlay relationships come from the numbering-plan authority; the place match is computed.
Which part of town has which code
Billings has a single code, so there is nothing to divide — every local line carries 406.
ZIP codes for the same city
Postal geography is organised separately from telephone geography, so Billings’s 14 ZIP codes do not map onto the codes above. They are listed in full, with the county each falls in, on the postal side of the site.