North American Numbers Source-cited · ownership disclosed
Area code
307
In service
United States · since 1947

Wyoming (statewide)

Area code 307 is the single area code for the entire state of Wyoming, in place since 1947. Wyoming's sparse population has never required more than one code.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Wyoming (statewide)
Type
geographic
Status
in service
In service since
1947
Projected exhaust
2054 Q4

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 307 is

All of Wyoming..

Communities served wholly or partly by 307:

CheyenneCasperLaramieGilletteJackson
B · Relationships

How it relates to other codes

The codes 307 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

What's changing. Single statewide code, no overlay. Not projected to exhaust until about 2050.
C · History

How 307 got here

1947
Established as Wyoming's sole area code, one of the 86 original North American area codes.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
525
Prefixes available
275
Thousands-blocks assigned
1,803

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 307 with another code →
Sources
Wikipedia ↗
Area code 307
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.