Area Code Box

Area code 307

Where is area code 307?

Cheyenne, Casper and Gillette, Wyoming

Local time: … (Mountain Time)

StateWyoming
CountryUnited States
Main citiesCheyenne, Casper and Gillette
Time zoneMountain Time
Overlay area codesNone
In service since1947
Assigned prefixes499
Dialing format(307) XXX-XXXX · +1 307 XXX XXXX from abroad

Look up a 307 number

Enter a 3-digit area code or a full 10-digit number.

Cities and towns in area code 307

Listed by how many phone prefixes (the 3 digits after the area code) are assigned to each place in 307.

Phone companies in area code 307

The carriers that hold the most 307 prefixes. People can move their number to another carrier, so this shows who first issued a number, not who serves it today.

PrefixesCarrier
83Qwest (Lumen)
65Union Telephone
60Verizon Wireless
49New Cingular Wireless PCS (AT&T)
40Onvoy
27Level 3 Communications
19Bandwidth.com CLEC
17Rt Communications

All 499 prefixes in area code 307

Pick the 3 digits after the area code to see that prefix’s city and carrier.

Questions

Where is area code 307?
Area code 307 is in Wyoming. It serves Cheyenne, Casper, Gillette, Jackson and Laramie and 87 other cities and towns.
What time zone is area code 307 in?
Area code 307 uses Mountain Time.
Is a call from area code 307 a scam?
The area code alone doesn’t tell you. Most calls from 307 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 307 number, let it go to voicemail.
When did area code 307 start?
307 went into service in 1947.
Can a 307 number be outside Wyoming?
Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 307 caller can be anywhere.