307 Area Code

Where is the 307 area code?

307 serves Cheyenne and nearby communities in Wyoming. In the wider directory it sits in the West region.

Dialing 307

Cheyenne is currently served by the single area code 307. Ten-digit dialing (area code + seven-digit number) always works and is increasingly the norm nationwide; some local calls may still connect with seven digits. If a future overlay is added, 10-digit dialing would become mandatory.

History of the 307 area code

307 is a geographic area code serving Cheyenne and the surrounding part of Wyoming. It was added after the original 1947 plan as telephone demand grew. For how codes are created, split, and overlaid, see how area codes work.

Is 307 a scam or spam risk?

307 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 307 number on your screen is no guarantee the caller is local or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.

Explore more

See every code in Wyoming, compare codes across the West region, or view all Mountain Time codes. You can also browse the 3XX block or the complete numeric list of US area codes.

New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.