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area code

Biggest city:





Mountain (GMT -7)

Nearby area codes: 

Zip codes



Major Cities:

Cheyenne, Casper, Gillette, Laramie, and Rock Springs​


Average Income:





Unemployment Rate:

The 307 area code is a key component of Wyoming's telecommunications infrastructure, uniquely covering the entire state. Statewide Coverage and Historical Significance: Established in 1947, the 307 area code is one of the original area codes introduced under the North American Numbering Plan. It is notable for covering the entire state of Wyoming, making it one of the few remaining area codes in the United States that serves an entire state. This statewide coverage has facilitated simplified telecommunications across Wyoming's diverse landscapes and communities. Economic and Cultural Impact: The 307 area code supports Wyoming's varied economy, which includes sectors such as energy production (oil, coal, and natural gas), tourism, and agriculture. The area code is essential for connecting businesses, government services, and residents, particularly in remote and rural areas. Wyoming's rich cultural heritage, including its significant role in the history of the American West and its numerous national parks and monuments, is also supported by this unified telecommunication system. No Overlay and Seven-Digit Dialing: Unlike many other states that have introduced overlay area codes and subsequently moved to ten-digit dialing, Wyoming continues to use seven-digit dialing within the 307 area code. This means that calls within Wyoming do not require the area code to be dialed for local calls, maintaining a simpler dialing process for residents and businesses. These facts about the 307 area code underscore its crucial role in supporting telecommunications across Wyoming. By providing a single, unified numbering plan, the 307 area code ensures efficient and straightforward communication throughout the state, catering to its diverse economic, cultural, and social needs.
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