State directory / Wyoming
US number directory / Wyoming
Wyoming
area codes
NANPA records 1 active geographic area code for Wyoming, including 307 from 1947.
1geographic area code
in this reference
in this reference
Earliest listed307 · 1947
Standard timeMT
Overlays in this stateNone recorded in this snapshot
Major city starting points
Cheyenne (capital and largest city): 307.
| City | Reference role | Codes to check |
|---|---|---|
| Cheyenne | Capital and largest city | 307 |
City reference · 2026-10-25
Codes, cities & coverage
NANPA lists no active overlay complex for Wyoming on 2026-10-25.
| Code | Region / major cities named in the reference | Introduced | Active overlay complexes |
|---|---|---|---|
| 307 | Wyoming (all) | 01-Jan-1947 | None active in NANPA snapshot |
NANPA dates & overlays · 2026-10-25
Wikipedia geography · 2026-10-25 · CC BY-SA 4.0
Time zones
Wyoming spans 1 standard-time offset in the state reference: MT.
| Standard offset | Region | Daylight saving |
|---|---|---|
| UTC−07:00 MT | Mountain | Yes |