Wyoming
(307) Area Code 307 — Cheyenne, Wyoming
307 Area Code – Cheyenne, Wyoming: Location, Time Zone & History
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Map of Area Code 307
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History & Cultural Notes
Wyoming has never needed to split or overlay its telephone numbering plan, a distinction it shares with only a handful of U.S. states. Area code 307 was assigned in 1947 as one of the original 86 North American area codes and has covered the entire state, unchanged, ever since.
That stability has outlasted real demographic change: the 2020 census counted 576,851 residents statewide, still the smallest population of any state, spread across a numbering plan area that has never contracted or been divided. Locals mark the coincidence informally as "307 Day," and more than 920 Wyoming-registered businesses incorporate the digits into their names, treating the code as a statewide brand rather than a mere dialing prefix.
Economically, the energy sector, oil, gas, and coal, remains central, alongside tourism drawn by Yellowstone and Grand Teton National Parks, ranching and agriculture, and continued mining activity. Beyond Cheyenne, the numbering plan area serves Casper, Gillette, Jackson, and Laramie, towns whose economies range from energy production to gateway tourism.