307 area code
Area code 307 is in Wyoming. It covers Cheyenne, Casper, Gillette and 215 other places: 169 ZIP codes in Laramie, Natrona, Campbell and 22 other counties. Local time there is , Mountain Time. In service since 1947, with no overlay.
Who calls from a 307 number
NANPA records the carrier each block of 307 numbers is assigned to. Of the 4.5 million 307 numbers assigned, 40% are with local phone companies (Qwest (CenturyLink) and Union Telephone Company); 37% with cable, internet-calling, business and other carriers (Onvoy and Bandwidth); 23% with mobile carriers (Verizon Wireless and AT&T Mobility).
That is who the numbers were assigned to: people keep their number when they change carrier, so any one number may have moved since.
| Carrier | Kind | Share |
|---|---|---|
| Qwest (CenturyLink) | Landline | 16% |
| Union Telephone Company | Landline | 14% |
| Onvoy | Cable, VoIP, other | 14% |
| Verizon Wireless | Mobile | 12% |
| AT&T Mobility | Mobile | 7% |
| Bandwidth | Cable, VoIP, other | 4% |
An area code says where a number was issued, not where the caller is: people keep their numbers when they move, and caller ID can be set to show any number, which the FCC calls spoofing. If a call you did not expect asks for money or personal details, the FCC advises hanging up and calling the company back on a number you look up yourself. Unwanted calls can be reported to the FTC at ReportFraud.ftc.gov.
Places in area code 307
The 75 places with a telephone rate centre of their own using 307, largest first. Each links to its ZIP codes.
Nearby places using 307
These places have no rate centre of their own in NANPA's records; the nearest one uses 307. Near an area-code boundary that can be wrong for part of a town.
- Ranchettes
- South Greeley
- Mills
- Fox Farm-College
- Bar Nunn
- Warren AFB
- Evansville
- North Rock Springs
- South Park
- Rozet
- Star Valley Ranch
- Sleepy Hollow
- Moose Wilson Road
- Banner
- Ethete
- Hoback
- Rafter J Ranch
- Ranchester
- Arapahoe
- Fort Washakie
- Mountain View
- Wilson
- Story
- Hartrandt
- Marbleton
- Vista West
- Grover
- Bear River
- Cowley
- Teton Village
- Thayne
- Smoot
- Powder Horn
- Yellowstone National Park
- Diamondville
- Byron
- Red Butte
- Reliance
- Lucerne
- Boulder Flats
- Pine Haven
- Purple Sage
- Bedford
- Rolling Hills
- Eden
- Turnerville
- Fe Warren Afb
- Casper Mountain
- Etna
- James Town
- Hudson
- Granite Canon
- Osmond
- Sinclair
- Alpine Northeast
- Bondurant
- Auburn
- Clearview Acres
- Dixon
- Granger
ZIP codes in area code 307
169 ZIP codes in 150 towns, by the town each is mailed to, largest first. Each links to its own page.
Where 307 numbers are issued
NANPA's rate centres with the most 307 prefixes (each prefix is 10,000 numbers), under NANPA's own abbreviated names.
| Rate centre | Place | Prefixes |
|---|---|---|
CHEYENNE | Cheyenne | 60 |
CASPER | Casper | 40 |
GILLETTE | Gillette | 21 |
JACKSON | Jackson | 21 |
LARAMIE | Laramie | 18 |
ROCK SPG | Rock Springs | 17 |
Counties
The counties of its ZIP codes, most residents first, with how many of its ZIP codes each has.
- Laramie County (17)
- Natrona County (11)
- Campbell County (6)
- Sweetwater County (9)
- Fremont County (11)
- Albany County (8)
- Park County (6)
- Sheridan County (8)
- Teton County (8)
- Lincoln County (15)
- Summit County (1)
- Carbon County (11)
- Converse County (2)
- Goshen County (8)
- Big Horn County (13)
- Platte County (5)
- Johnson County (4)
- Sublette County (5)
- Washakie County (2)
- Crook County (7)
- Weston County (3)
- Uinta County (5)
- Hot Springs County (2)
- Niobrara County (1)
- Bonneville County (1)
Which code covers where you are now? What area code am I in? answers from your location.
Questions about area code 307
Where is area code 307?
Area code 307 is in Wyoming. It covers Cheyenne, Casper, Gillette and 215 other places: 169 ZIP codes in Laramie, Natrona, Campbell and 22 other counties.
What ZIP codes are in area code 307?
169 ZIP codes, by the town each is mailed to: Cheyenne (8, 82001 to 82010), Casper (5, 82601 to 82609), Gillette (3, 82716 to 82718), Laramie (4, 82070 to 82073) and 146 more towns. The full list is on this page.
What time zone is area code 307 in?
Mountain time.
Is a 307 number a mobile or a landline?
It can be either. 23% of 307 numbers are assigned to mobile carriers and 40% to local phone companies (NANPA, 2026-10-10); the rest are with cable, internet-calling, business and paging carriers. A number keeps its area code when it moves to another carrier.
Does a 307 number mean the caller is in Wyoming?
Not necessarily. An area code says where the number was first issued. People keep their numbers when they move or switch carriers, and calling software can show any number, so a 307 call can come from anywhere.
All 1 Wyoming area codes, by area, with the cities each covers
Source: NANPA NPA database, central office code and thousands-block assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.
Cite this page
zipcodes.pro. “Area code 307.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-code/307
Underlying data is public domain or openly licensed — sources, vintages and licences.