WYOMING · AREA CODE GUIDE
307 area code location: Cheyenne and Casper, Wyoming
- Local date and time
- Mountain Time
Map data: HSIP (2010) · NANPA · US Census Bureau, checked 26 September 2026. Boundaries are approximate.
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Download the 307 area code map
A printable area code 307 location map, with time zone and state. Use the PNG image in a document or slide; the SVG stays sharp at any size.
307 area code at a glance
- State
- Wyoming
- Primary cities
- Cheyenne, Casper, and Gillette
- Established
- Population
- Largest community: Cheyenne, 66,507 (2025)Not an area-code population.
- Prefixes in service
- 497 as of 13 October 2026
An area code does not show where a caller is now.
History
Country and calling code: United States (+1).
New code planned: No, as of 22 September 2026.
Time zone
- Mountain Time
- Standard time UTC−07:00
- Daylight saving time UTC−06:00
Counties and cities covered
307 numbers are issued across 92 communities. These are telephone exchange areas, which follow the phone network rather than city limits, so a place can sit just outside the boundary of the town it is named for.
Counties of the communities we could place (the code may reach further): Carbon County, Big Horn County, Lincoln County, Fremont County, Laramie County, Park County, Platte County, Crook County, Goshen County, Albany County, Campbell County, Converse County, Johnson County, Natrona County, Sheridan County, Sublette County, Sweetwater County, Uinta County, Washakie County, Weston County, Hot Springs County, Niobrara County, and Teton County.
- Cheyenne
- Casper
- Gillette
- Laramie
- Rock Springs
- Sheridan
- Evanston
- Green River
- Riverton
- Jackson
- Cody
- Rawlins
- Lander
- Powell
- Douglas
- Torrington
- Buffalo
- Worland
- Wheatland
- Newcastle
- Thermopolis
- Glenrock
- Kemmerer
- Lovell
- Afton
67 more communities
- Lyman
- Pinedale
- Saratoga
- Greybull
- Wright
- Lusk
- Alpine
- Basin
- Sundance
- Pine Bluffs
- Guernsey
- Moorcroft
- Dubois
- Upton
- Hanna
- Shoshoni
- Cokeville
- Encampment
- Baggs
- Burns
- Lingle
- Burlington
- La Barge
- Big Piney
- Lagrange
- Hulett
- Meeteetse
- Midwest
- Kaycee
- Ten Sleep
- Glendo
- Medicine Bow
- Rock River
- Chugwater
- Albin
- Frannie
- Clearmont
- Alta
- Arvada
- Border
- Carpenter
- Clark
- Crowheart
- Daniel
- Decker
- Farson
- Freedom
- Gas Hills
- Hamilton Dome
- Hyattville
- Jeffrey City
- Lake
- Leigh Canyon
- Mammoth
- Manila
- Moran
- Mountain View
- Old Faithful
- Shirley Basin
- South Alzada
- South Wyola
- Southeast Sheridan
- Urie
- West Belle Fourche
- West Edgemont
- West Lyman
- West Spearfish
Notable places in 307
| Place | Where | What it is |
|---|---|---|
| Yellowstone National Park | 9.4 km from Lake | National Park |
| Grand Teton National Park | 15.5 km from Moran | National Park |
| University of Wyoming | 2.1 km from Laramie | University, 12,323 12-month enrollment (2023–24) |
| Francis E. Warren Air Force Base | 5.8 km from Cheyenne | US Air Force installation |
| Jackson Hole Airport | 15.4 km from Jackson | Commercial airport, 518,754 enplanements (2024) |
| Cheyenne Regional Airport | 3.4 km from Cheyenne | Commercial airport, 27,602 enplanements (2024) |
| Casper–Natrona County International Airport | 13.8 km from Casper | Commercial airport, 99,658 enplanements (2024) |
| Fort Phil Kearny | 23.3 km from Buffalo | Fortification |
| Fort Yellowstone | 0.4 km from Mammoth | Military base |
| Fort Laramie | 17.6 km from Guernsey | Fortification |
Questions about 307
Where is the 307 area code?
307 is in Wyoming. Its numbers are issued in Cheyenne, Casper, Gillette, and 89 other communities.
What time zone is area code 307 in?
307 is in Mountain Time. Daylight saving time is observed.
What cities are in the 307 area code?
Cheyenne, Casper, Gillette, Laramie, and Rock Springs, and 87 other communities.
What state is area code 307 in?
Area code 307 is in Wyoming.
What counties are covered by area code 307?
Area code 307 covers communities in Carbon County, Big Horn County, Lincoln County, Fremont County, Laramie County, Park County, Platte County, Crook County, Goshen County, Albany County, Campbell County, Converse County, Johnson County, Natrona County, Sheridan County, Sublette County, Sweetwater County, Uinta County, Washakie County, Weston County, Hot Springs County, Niobrara County, and Teton County.
Is 307 a toll-free area code?
No. 307 is a geographic area code. The toll-free codes are 800, 833, 844, 855, 866, 877, and 888.
Sources: NANPA area code listing, NANPA places by area code, NANPA central office code assignments, U.S. Census Bureau population estimates, OMB metropolitan area delineations. Checked .
Business phone numbers in area code 307, answered by an AI agent
A local number for Cheyenne, Casper, and Gillette, Wyoming, with an AI receptionist that takes caller details, answers the questions you give it, and books appointments. Numbers depend on what carriers have left.