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307 Area Code

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April 11, 2026 • 6 min Read

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307 AREA CODE: Everything You Need to Know

307 area code is a unique and special area code that serves the state of Wyoming, USA. With a population of around 579,000 people, Wyoming is the least populated state in the country, and the 307 area code is an essential part of its communication infrastructure. In this comprehensive guide, we'll delve into the world of 307 area code, covering its history, uses, and practical information that you need to know.

History of 307 Area Code

The 307 area code was first introduced in 1947, when it was assigned to the state of Wyoming. At that time, the area code was a single code, covering the entire state. Over the years, as Wyoming's population grew, the area code was split into two separate codes: 307 and 307.

The 307 area code has undergone several changes since its introduction. In 1989, the North American Numbering Plan Administration (NANPA) split the 307 area code into two separate codes: 307 and 307. This change was made to alleviate the growing demand for phone numbers in the state.

Today, the 307 area code is an essential part of Wyoming's communication infrastructure, serving both residential and business communities across the state.

Uses of 307 Area Code

The 307 area code is used for a variety of purposes, including:

  • Residential phone numbers
  • Business phone numbers
  • Mobility numbers (e.g., cell phones)
  • VoIP (Voice over Internet Protocol) numbers

The 307 area code is also used for toll-free numbers, such as 1-800 numbers, which are commonly used for customer service and support.

Additionally, the 307 area code is used for special services, such as emergency services, like 911, and non-emergency services, like 311.

Area Code Boundaries

The 307 area code covers the entire state of Wyoming, with some exceptions. The following counties are included in the 307 area code:

County County Seat
Albany Laramie
Big Horn Basin
Carbon Rawlins
Converse Douglas
Crook Sundance
Fremont Lander
Hot Springs Thermopolis
Johnson
Lincoln Kemmerer
Natrona Casper
Platte
Sheridan Sheridan
Sublette
Sweetwater Rock Springs
Teton Jackson
Uinta
Washakie

Tips for Using 307 Area Code

When using the 307 area code, keep the following tips in mind:

  • Make sure to dial the correct area code when making a call from outside the state.
  • Use the 307 area code for local calls within the state.
  • Be aware of any toll-free numbers that use the 307 area code.
  • Be cautious when using VoIP services, as they may require special setup to work with the 307 area code.

By following these tips, you can ensure that your calls are connected efficiently and effectively, and that you get the best possible service from your phone provider.

Practical Information

Here are some practical tips and information to keep in mind when using the 307 area code:

Phone numbers in the 307 area code typically have 7 digits, followed by the area code. For example, a phone number in the 307 area code might look like this: 307-123-4567.

When making a call from outside the state, you'll need to dial the 1-307 area code prefix to connect to a phone number in the 307 area code.

Some phone providers may charge extra for calls to the 307 area code, so be sure to check your provider's rates before making a call.

Additionally, some phone services may require special setup to work with the 307 area code, so be sure to check with your provider before using their services.

307 area code serves as a unique identifier for phone numbers in the state of Wyoming, primarily serving the cities of Cheyenne, Casper, and Lander, among others. This area code is one of the original area codes established in 1947 and has undergone several splits and overlays to accommodate the growing demand for phone numbers.

History and Evolution

The 307 area code has a rich history dating back to the early days of the telephone industry. Initially, it covered the entire state of Wyoming, but as the population grew and phone usage increased, the need for additional area codes became apparent. In 1995, the 307 area code was split into two separate area codes: 307 and 385. The 307 area code retained its original service area, while the 385 area code covered the southwestern part of the state. This split allowed for the efficient allocation of phone numbers and reduced the likelihood of number exhaustion. The 307 area code has undergone several overlays since its creation, including a complex overlay with the 385 area code in 1999. This overlay allowed for the reuse of phone numbers in the 307 area code, which had become scarce. The overlay added an additional layer of complexity to the numbering system, requiring phone companies to implement special routing procedures to ensure efficient call delivery.

Pros and Cons

The 307 area code has its advantages and disadvantages. One of the primary benefits is its unique association with the state of Wyoming, making it a distinctive identifier for residents and businesses. The area code is also relatively simple to remember and dial, which reduces the likelihood of incorrect calls. However, the 307 area code has faced criticism for its limited availability of new phone numbers. The area code has undergone several splits and overlays, which can lead to confusion and inconvenience for users. Additionally, the complexity of the overlay system can result in higher costs for phone companies to implement and maintain.

Comparison with Other Area Codes

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