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Wyoming Area Codes

Wyoming has 1 area code in service: 307.

CheyenneCasperGilletteLaramieRock SpringsSheridanEvanstonGreen RiverRivertonJacksonCodyRawlinsLanderPowellDouglasRanchettesTorringtonCheyenneCasperGilletteLaramieRock SpringsSheridan
Largest cities in Wyoming

Largest cities

CityArea codes
Cheyenne307
Casper307
Gillette307
Laramie307
Rock Springs307
Sheridan307
Evanston307
Green River307
Riverton307
Jackson307
Cody307
Rawlins307

All area codes in Wyoming

CodeMain citiesOverlayIn service sinceProjected exhaust
307Cheyenne, Casper, Gillette, Laramie—19472054

499 prefixes are in use across Wyoming. Exhaust years are NANPA's 2026 forecast.