307 Area Code: Cheyenne, Wyoming

Wyoming is served by a single area code, 307, which covers the entire state. Cheyenne — the state capital — anchors the directory's records here. Cheyenne sits in the southeastern corner of Wyoming on the high plains where the floor of the plains meets the foothills of the Laramie Range to the west, organized around the Wyoming State Capitol, F.E. Warren Air Force Base, and a long-running role as the regional commercial center for southeastern Wyoming. The 307 footprint takes in Casper, Laramie (the University of Wyoming's main campus), Gillette (the heart of the Powder River Basin's coal-and-energy industry), Jackson, and the rest of the state's communities.

Because 307 covers Wyoming entirely, the directory's records associated with 307 numbers do not surface a recurring set of out-of-state cities through the routine cross-linkage patterns that dominate larger codes. Where other-place names do appear, they reflect the same kinds of public-record dynamics seen elsewhere — numbers porting between carriers, addresses tied to multiple residences, and prior registrations surfacing alongside current ones. The directory currently documents 254 distinct prefixes within 307 in detail, a working subset of the prefix population the code actually carries.

Cheyenne's home values come in close to the US median, with median household income running close to the national figure. The city's median age sits close to the US reading, and population is modest in absolute terms — Cheyenne is the largest city in Wyoming but small in the broader US frame, anchoring a regional economy organized around state government, the air-force base, and the surrounding ranching and energy-sector counties.