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Area Code Overview
Area code 307 is a geographic telephone area code in Wyoming that went into service on January 1, 1947. The geographic regions covered by this area code overlay has a population of approximately 587,618.
Overlay and Dialing Rules
- Area Code: 307
- State: Wyoming
- Type: General Purpose Code
- In Service Date: January 1, 1947
- Overlay Complex: 307
- Local Dialing Plan: This area does not require you to dial the area code when calling locally.
Estimated Number of Assigned Phone Numbers in Area Code 307
This area code is ranked 228th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 1st out of 1.
3,889,000
Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 307
Wireline and VoIP
2,375,000 assigned
61.07%
Other / Unclassified
644,000 assigned
16.56%
Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 307
Estimated assigned wireless phone numbers: 870,000
Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.
Verizon Wireless 439,000 (50.46%)
AT&T Wireless 273,000 (31.38%)
T-Mobile 155,000 (17.82%)
N.E. COLORADO CELLULAR, INC. 2,000 (0.23%)
Optimum Mobile 1,000 (0.11%)
Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 307
Estimated assigned wireline and VoIP phone numbers: 2,375,000
UNION TELEPHONE COMPANY 640,000 (26.95%)
Bandwidth 152,000 (6.40%)
CHARTER IP ENABLED SERVICES, LLC 55,000 (2.32%)
TERRA NOVA TELECOM INC. 32,000 (1.35%)
UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 30,000 (1.26%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 23,000 (0.97%)
Other / Unclassified Assigned Numbering in Area Code 307
Estimated assigned other or unclassified phone numbers: 644,000
RT COMMUNICATIONS 160,000 (24.84%)
UNION TEL. CO. 100,000 (15.53%)
TRI-COUNTY TEL. ASSN., INC. 80,000 (12.42%)
ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY 34,000 (5.28%)
SILVER STAR TEL CO INC 31,000 (4.81%)
DUBOIS TEL. EXCH., INC. 30,000 (4.66%)
RANGE TEL COOP INC 30,000 (4.66%)
TELEPORT COMMUNICATIONS AMERICA WY-LLC 29,000 (4.50%)
TRI TEL, INC. 25,000 (3.88%)
GOLD STAR COMMUNICATIONS, LLC 22,000 (3.42%)
ALL WEST COMMUNICATIONS - WY 20,000 (3.11%)
Cities and Towns in Area Code 307
Afton, Wyoming Albin, Wyoming Alpine, Wyoming Alta, Wyoming Arvada, Wyoming Baggs, Wyoming Basin, Wyoming Big Piney, Wyoming Border Junction, Wyoming Buffalo, Wyoming Burlington, Wyoming Burns, Wyoming Carpenter, Wyoming Casper, Wyoming Cheyenne, Wyoming Chugwater, Wyoming Clark, Wyoming Clearmont, Wyoming Cody, Wyoming Cokeville, Wyoming Crowheart, Wyoming Daniel, Wyoming Douglas, Wyoming Dubois, Wyoming Encampment, Wyoming Evanston, Wyoming Farson, Wyoming Frannie, Wyoming Freedom, Wyoming Gillette, Wyoming Glendo, Wyoming Glenrock, Wyoming Green River, Wyoming Greybull, Wyoming Guernsey, Wyoming Hanna, Wyoming Hulett, Wyoming Hyattville, Wyoming Jackson, Wyoming Jeffrey City, Wyoming Kaycee, Wyoming Kemmerer, Wyoming La Barge, Wyoming Lagrange, Wyoming Lake, Wyoming Lander, Wyoming Laramie, Wyoming Lingle, Wyoming Lovell, Wyoming Lusk, Wyoming Lyman, Wyoming Mammoth, Wyoming Medicine Bow, Wyoming Meeteetse, Wyoming Midwest, Wyoming Moorcroft, Wyoming Moran, Wyoming Mountain View, Wyoming Newcastle, Wyoming Pine Bluffs, Wyoming Pinedale, Wyoming Powell, Wyoming Rawlins, Wyoming Riverton, Wyoming Rock River, Wyoming Rock Springs, Wyoming Saratoga, Wyoming Sheridan, Wyoming Shirley Basin, Wyoming Shoshoni, Wyoming Sundance, Wyoming Ten Sleep, Wyoming Thermopolis, Wyoming Torrington, Wyoming Upton, Wyoming Urie, Wyoming Wheatland, Wyoming Worland, Wyoming Wright, Wyoming How These Figures Were Built
These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 307, not live customer counts.
Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.
They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.
Population data and locality matching provided by GeoNames.
Last refreshed: April 15, 2026 6:22 pm