🇺🇸 307 area code
Area code 307 covers Casper, Cheyenne, Gillette and Jackson and the surrounding area in Wyoming. Enter a 307 number below for a free check before you call back.
- Location: Casper, Wyoming
- Time zone: Mountain (UTC−7)
- In service since 1947
Consultar um número
Validade, operadora, tipo de linha e região na primeira passagem.
Area code 307 at a glance
- Area code
- 307
- Location
- Wyoming, United States
- Main cities
- Casper, Cheyenne, Gillette, Jackson, Laramie, Sheridan
- Time zone
- Mountain (UTC−7)
- Local time now
- —
- In service since
- 1947
- Local calls
- Dial 7 digits
- Number format
- (307) 555-0123
- From abroad
- +1 307 555 0123
Cities in area code 307
- Casper
- Cheyenne
- Gillette
- Jackson
- Laramie
- Sheridan
- Cody
- Rock Springs
- Afton
- Lander
Is a 307 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 307 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 307 number to people in Wyoming because a local-looking call is more likely to be answered. If a 307 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 307
307 is one of the original North American area codes, created in 1947 when AT&T and the Bell System first divided the continent into numbering plan areas.
Perguntas frequentes
Area code 307 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 307?
Area code 307 is in Wyoming, United States. It covers Casper, Cheyenne, Gillette, Jackson, Laramie and Sheridan.
What time zone is area code 307?
307 is in the Mountain (UTC−7) time zone, and observes daylight saving time.
When did area code 307 start?
307 entered service in 1947.
How do I find out who called me from 307?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 307?
If you live in or near Wyoming, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 307 callers who will not leave a message are best looked up before you call back.
Got a call from 307?
Run the free check first — validity, carrier, line type and region — and unlock the full report only if you need it.