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Wyoming Area Codes

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State: Wyoming (WY)
Area Codes: 1
Timezone: Mountain (MDT)
Current Time: 7:45 PM

About Wyoming Area Codes

Wyoming (WY) uses 1 telephone area code to serve its residents and businesses. With an estimated population of 490,393, Wyoming is one of the smaller states in the North American Numbering Plan (NANP). The state is primarily in the Mountain Time Zone (MDT). The current local time in Wyoming is 7:45 PM.

The largest cities in Wyoming include Cheyenne (pop. 79,484), Casper (pop. 67,598), Gillette (pop. 36,032), Laramie (pop. 33,929) and Rock Springs (pop. 25,913) . Wyoming has 23 counties spread across its territory. Each area code in WY covers a geographic region of the state, with some areas using overlay codes that share the same geographic territory as an existing area code.

When calling a Wyoming phone number from outside the area code, you must dial the full 10-digit number: the 3-digit area code followed by the 7-digit local number. Many parts of Wyoming now require 10-digit dialing even for local calls due to overlay area codes and the nationwide 988 Suicide & Crisis Lifeline implementation.

All Wyoming Area Codes

The table below lists every active area code in Wyoming, along with the major city served and other cities covered by each code.

Area Code Major City Other Cities
307 Cheyenne Casper, Gillette, Laramie, Rock Springs, Sheridan, Jackson, Riverton, Green River and more

Largest Cities in Wyoming

These are the largest cities in Wyoming by population, along with their primary area codes and counties.

City Population County
Cheyenne 79,484 Laramie County
Casper 67,598 Natrona County
Gillette 36,032 Campbell County
Laramie 33,929 Albany County
Rock Springs 25,913 Sweetwater County
Sheridan 19,320 Sheridan County
Jackson 12,576 Teton County
Riverton 12,445 Fremont County
Green River 11,906 Sweetwater County
Evanston 11,641 Uinta County

Frequently Asked Questions

Wyoming has 1 active area code. These include 307 (Cheyenne) .

Wyoming is primarily in the Mountain Time Zone (MDT). The current local time is 7:45 PM.

The area code covering the most cities in Wyoming is 307, which serves Cheyenne and 84+ other communities.

Yes, most areas in Wyoming now require 10-digit dialing (area code + 7-digit number) for all local calls. This requirement was implemented across the United States starting in October 2021 to support the 988 Suicide & Crisis Lifeline. Even if you are calling within the same area code, you need to dial all 10 digits.

To call a Wyoming number from within the United States, dial the area code followed by the 7-digit phone number (e.g., 307-XXX-XXXX). From outside the US, dial your country's exit code, then 1 (the US country code), then the full 10-digit number.

Wyoming has 23 counties. The state's total estimated population is 490,393, spread across these counties and served by 1 area code.

Cheyenne is served by area code 307 .
Wyoming at a Glance
  • Abbreviation WY
  • Area Codes 1
  • Population 490,393
  • Counties 23
  • Cities 186
  • Time Zone Mountain
  • Current Time 7:45 PM
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