307 Area Code| Location | Cities | Time Zone & Number Generator

The area code 307 is something special: the area code represents the whole state of Wyoming in the USA. The low population density in Wyoming has made it possible to have only one area code since 1947. Indeed, the original 307 was an area code used in North America when 307 was given in 1947, and it is the only one that Wyoming has today. In the entire U.S., Wyoming is also one of the few states that is still covered by a single area code, and therefore, 307 has become a symbol of this state. An illustration is that Phone2.io states that area code 307 is used for all of the state of Wyoming and is one of only a few remaining states in the United States that has a single area code.

Coverage and Key Cities

The coverage of area code 307 is simple; the area covers all counties and cities in Wyoming. Cheyenne (state capital) is the biggest city, then there is Casper and Laramie. To take the example, the population of Cheyenne is approximately 59,500, whereas that of Casper is approximately 55,300. The other major cities are Laramie (approximately 30800), Gillette (approximately 29000) and Rock Springs (approximately 23000). The five cities in Area Code 307 with the highest population, as per the recent information, are the following:

• Cheyenne, WY: ~59,466 residents.
  
• Casper, WY: ~55,316 residents.
  
• Laramie, WY: ~30,816 residents.
  
• Gillette, WY: ~29,087 residents.
  
• Rock Springs, WY: ~23,036 residents.
  

The 5 cities constitute most of the population in Wyoming. The rest is widely dispersed in small towns and rural areas all with the prefix of 307. As an illustration, Sheridan (17,444), Green River (12,515) and Evanston (12,359) represent the larger communities, all of which are less than 307.

The neighbors of Wyoming have other codes to the west: Idaho uses 208 and 986, Montana uses 406, South Dakota uses 605, Nebraska uses 308 (in its panhandle region), Utah uses 801/435/385, and Colorado uses 970/719/720/970. However, within the state of Wyoming, every metropolis, from Jackson Hole to Cheyenne, is using 307.

History and Future of 307

There is an interesting history of the 307 area code. It was invented in 1947 as an element of the first North American Numbering Plan. At the time, AT&T opted to serve the entire state of Wyoming with 307. The central number 0 was used to show that it was a whole-state code (not part of a state). Wyoming did not have to amend 307 as many other states did after separating into several codes or putting on an overlay. The limited number of people has also ensured that there is a large supply of available phone numbers.

Actually, even just recently, 2025 specialists admitted that Wyoming will retain 307 years to come. The North American Numbering Plan Administrator (NANPA) analysis reveals that there is still a lot of capacity in 307. According to a NANPA official, the depletion of Wyoming 307 numbers will not happen for at least 20 years. It would imply that businesses and residents who are using 307 now are unlikely to get another area code until the 2040s. This sustainability is a blessing to Wyoming people who are proud of the 307 number. In comparison, the states with high growth rates such as Colorado, have recently introduced several new codes.

Wyoming remains one of the 7-digit local calling states since 307 does not have any overlays. Any person making calls in the state of Wyoming can simply make a local call by dialing the 7 digits of the phone number. Nonetheless, when you make an out-of-state or out-of-area code call, you have to add 1-307-xxx-xxxx(the 10-digit number) to the number. The authority that regulates area codes in North America (NANPA) regulates these dialing rules and ensures that 307 is regulated through its plan.

Time Zone and Calling

Wyoming is completely within the Mountain Time Zone (MT). Mountain Time is observed in all cities from Cody to Laramie. The clock on the page shows the time based on the America/ Denver time zone, showing the local time of 307. Since the area code is within one time zone, there is no misunderstanding regarding the time difference for the local calls.

In dialing a 307 number, you will have to use a dialing process depending on the location of the call:

• Local Calls (within 307): Dial the 7-digit number. No need to add the 307 code.
  
• Within the USA, from another area code: Dial 307 + 7-digit number (10 digits total).
  
• International Calls: Follow international dialing rules, then 1-307-xxx-xxxx.
  

NANPA and the FCC have established these rules for all area codes in the U.S. It is worth noting that since Wyoming is not overlaid, it has one of the few areas where a 7-digit dial is still used on local calls.

Major Carriers and Phone Services

Some of the large telecommunication firms operate in Wyoming with an area code of 307. In Wyoming, the biggest wireless carriers are Verizon, AT&T and T-Mobile. These are cellular and mobile service offering companies in the state, from Cheyenne to Jackson. As an example, prefixes in 307 are Verizon Cheyenne exchanges (prefix 214) and AT&T Casper exchanges (prefix 215). CenturyLink (previously Qwest) is a large provider of landline and internet in Wyoming, too.

AT&T, Verizon, T-Mobile or CenturyLink is randomly listed in the tool under the column of the Carrier: This is an indication that every one of these carriers is represented in Wyoming. Practically, all three large wireless operators cover the majority of the population centers. Smaller local carriers like Union Telephone and Range Telephone Cooperative cover rural areas. The column of the table titled “Line Type” determines whether a number is a Mobile, a Landline number or a VoIP number. Wyoming has a high mobile and landline penetration, and VoIP (calling over the internet) has been on the rise, particularly in business or remote locations.

This home phone is a cordless home phone that is local calling area code 307. Such a phone, on dialing 307 in Wyoming (degree of 7-digit dialing within the state), could make a call across the state. AT&T and Verizon are the major carriers that offer coverage. The keypad highlights the use of a 10-digit number (1-307-###-####) in placing calls outside the area. If you also want to know about 201 Area code visit page.

307 Code Phone Number Generator Tool

This page has a 307 Phone Number Generator that is created to be used by developers, testers, and marketers. It generates 10-digit telephone codes based on the area code 307. Here is how it works:

• Click “Generate Numbers.” The tool then generates phone numbers with the format (307) ###-#### and one per line.
  
• Randomized details: Every generated row also contains a Status (Available, In Use, or Unknown), a Carrier (AT&T, Verizon, T-Mobile, or CenturyLink), a Line Type (Mobile, Landline or VoIP) and a City.
  
• Copy or download results: Once you have created it, you can use the button that says “Copy Table” and copy all the entries to your clipboard or you can use the button that says “Download CSV” and save the list in a spreadsheet.
  

Status is a fictitious available indicator that varies. It is based on real carrier data. The cities are only listed to taste – any of the five major cities as well as others in the state can be included in the City column. Since the region is attached to Wyoming, all the rows indicate Wyoming, USA in the Region column.

The generator can be applied in a number of ways. These numbers may be used to populate databases, do call log simulations, or test forms by software developers and QA testers without actual personal information. The phone format is correct, yet the numbers are selected. The tool may be used in testing SMS campaigns or CRM systems by marketers or analysts to generate sample local number lists. It might also be useful in the educational or demo sense: e.g., teaching the mechanism of phone numbers without revealing the real numbers of anyone.

Cultural Significance of 307 Area Code

In addition to the technical aspect, the 307 area code has also served to become a symbol of culture in Wyoming. Local people always view 307 as a source of identity. According to the media articles, area codes may reduce state pride. In Wyoming, this is indeed the case: the T-shirts, stickers and local business names have the number 307 on them. According to our experts, “Wyoming 307 is sacred because for at least another 20 years the state will have no more area codes than 307 and over 900 Wyoming businesses begin with the 307 name. Cases in point are 307 Vodka and 307 Dog Wash brands that boast the area code as the brand name. The local pride of the code is even commemorated with an informal day known as the “307 Day,” which is celebrated on March 7 (3/07) in Wyoming.

This implies that when it comes to Wyoming, a sense of place is easily portrayed when someone gives a phone number beginning with 307. It automatically marks the caller as a Wyoming-based one. 307 is good for the branding of many businesses and residents. According to one article, companies often incorporate the area code in their names as a branding device and symbol of being from Wyoming.

Additional Information and References

• NANPA is the administration that regulates area code 307. NANPA is a non-governmental agency supervised by the FCC that administers all of the area codes in the United States. Its website offers official planning documents and maps.
  
• Rules and code assignments. Official dialing rules and code assignments may be found on the NANPA site or the FCC numbering resources.
  
• In need of carrying out a phone look-up (reverse look-up) on a number, remember that there are local directories and carriers in Wyoming. It is a tool that is centered on area code information and number generation as opposed to name/address search.
  
• Other area code references, like area code maps or demographic data The Wyoming area code can be found elsewhere.
  

In summary, area code 307 can be equated to Wyoming. A complete overview of 307 flights, 307 history, 307 time zone, and 307 airlines is provided on this page and tool, as well as a convenient generator to generate sample 307 phone numbers to test or sell. You are a developer who requires fake data, a marketer researching outreach in the area or a person who just wants to know the phone code of Wyoming, this resource will take care of your needs.