307 Area Code — Cheyenne, WY
Area code 307 serves Cheyenne and 4 other cities in Wyoming. Local time follows America/Denver. It has no overlay codes.
- State
- Wyoming
- Primary city
- Cheyenne
- Timezone
- America/Denver
- In service since
- 1947
- Type
- Geographic
- Overlay codes
- None
Cities Served by 307
The 307 area code covers 5 cities and communities in Wyoming.
- Cheyenne
- Casper
- Laramie
- Gillette
- Rock Springs
About Area Code 307
Area code 307 is a North American Numbering Plan (NANP) area code that has been in service since 1947. It is administered by NANPA on behalf of the FCC and serves the Wyoming region anchored on Cheyenne.
307 is currently a single-coverage geographic area code with no overlays. This means a 7-digit number in this area code is unique within its rate centers, though best-practice is always to dial the full 10-digit number when contacting a 307 line.
Mobile numbers in 307 are portable: a person who moved away from Cheyenne may still carry a 307 mobile number on their device. If you receive an unexpected call from a 307 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in Wyoming, you may also interact with neighbouring or overlay codes. See the related codes section below to explore the rest of Wyoming.
307 Area Code FAQ
Where is area code 307?
Area code 307 is located in Wyoming, primarily serving Cheyenne and surrounding cities including Casper, Laramie, Gillette. The region operates on MT (America/Denver) time.
What state is 307 area code?
307 is a Wyoming area code. It was put into service in 1947 and has no overlay codes — it covers its geographic area exclusively.
Is 307 a scam area code?
307 is a legitimate North American area code allocated by NANPA to Wyoming. Like any geographic area code, scammers sometimes spoof 307 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 307 use?
Area code 307 operates on MT (America/Denver). Numbers in this area code follow standard Wyoming time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 307 phone number?
Yes. Use the reverse lookup widget above to enter a full 307 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.