307 Area Code: Location, History, and Fun Facts

Senior Writer: Supriya Bajaj

Updated : August 4, 2025

Overview of 307 Area Code

• Area Code: 307
• Overlay Code: None
• Location: Entire state of Wyoming
• Major Counties: Laramie County, Natrona County, Campbell County, Sweetwater County, Albany County
• Main Cities Covered: Cheyenne, Casper, Gillette, Rock Springs, Laramie, Sheridan
• Nearby Area Codes: 406 (Montana), 701 (North Dakota), 308/402 (Nebraska), 970/719 (Colorado), 435/801 (Utah), 208 (Idaho), 605 (South Dakota)
• Time Zone: Mountain Time (MT) – UTC?7 (Standard), UTC?6 (Daylight Saving)
• Introduced: October 1947
• Assigned By: North American Numbering Plan Administration (NANPA)
• Population in Coverage Area: Approx. 580,000 (as of 2024)
• Type: Geographic / Statewide area code
• Overlay Requirement: Not required; 7-digit dialing still possible in many areas
• Popular for: Rural living, state government, energy sector, and tourism

The 307 area code stands as the only area code serving the state of Wyoming, making it a rare example of a single-code state in the United States. Originally assigned in 1947 as part of the North American Numbering Plan (NANP), it has maintained its identity without any splits or overlays.

Used for landlines and mobile phones, the 307 phone number is synonymous with local authenticity and community-driven communication across all of Wyoming’s cities and rural areas. In this blog, we’ll explore how businesses use a 307 number to signal regional authenticity and strengthen their presence in the market.

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Where Is the 307 Area Code Located?

The 307 area code location is in the U.S. state of Wyoming and covers the entire state. It is the only area code used in Wyoming, making it one of the few U.S. states with a single area code. This includes major cities and towns such as Cheyenne, Casper, Laramie, Gillette, Jackson, and Rock Springs, as well as all rural areas across the state.

The 307 area code has been in use since 1947 and reflects Wyoming’s relatively low population density and unified telecommunications structure.

Cities and Counties Covered

The 307 area code spans the entire state of Wyoming, including key cities and counties such as:

State and Regional Context

Wyoming is renowned for its expansive landscapes, close-knit communities, and a robust natural resources industry. The 307 area code plays a vital role in connecting residents, businesses, and public services across the entire state. 

Despite its low population density, this single area code ensures seamless communication from urban centers like Cheyenne to remote rural towns. It also reinforces a sense of unity and shared identity among Wyoming’s residents, making 307 more than just a number as a symbol of regional pride.

Nearby Area Codes

While Wyoming uses only 307, neighboring states include:

• Montana – 406
  
• Colorado – 303, 720
  
• South Dakota – 605
  
• Nebraska – 308, 402
• Utah – 801, 435

307 Area Code Phone Number Format & How to Dial

Calling a 307 phone number is straightforward, whether locally or internationally.

1. Dialing from within the U.S.

1 (U.S. long-distance prefix) + 307 (area code) + 7-digit number

Example: 1 + 307 + 7-digit number

2. Dialing from outside the U.S.

[Your country’s exit code] + 1 (U.S. country code) + 307 + 7-digit number

Example (UK): 00 1 307 XXX XXXX
Example (India): 011 1 307 XXX XXXX

Time Zone of the 307 Area Code

The 307 area code operates in the Mountain Time Zone (MT), which alternates between Mountain Standard Time (MST) and Mountain Daylight Time (MDT) depending on the season. Let’s check out the 307 area code time zone.

History of the 307 Area Code

Established in 1947, the 307 area code is one of the original codes introduced as part of the North American Numbering Plan. Over the decades, it has uniquely remained unchanged, still covering all of Wyoming without requiring any splits or overlays.

This longevity underscores the state’s relatively low population density and strong local identity, making 307 a badge of regional pride.

Business Scenario and Outlook in the 307 Area Code

Wyoming’s economy remains resilient, powered by key sectors like energy, agriculture, and especially tourism. Wyoming’s gross state product (GSP) in 2025 reached $41.2 billion, with a 2.6% growth over the 5 years to 2025. Cities like Casper and Cheyenne are experiencing steady growth, with a mix of established enterprises and a rising startup ecosystem.

A 307 phone number plays a vital role in helping local businesses strengthen their Wyoming identity, while also allowing out-of-state companies to establish immediate credibility in the region. Whether you’re launching a logistics business in Rock Springs or offering tourism services in Jackson Hole a hotspot drawing millions each year a 307 area code showcases your regional commitment and enhances customer trust.

Benefits of a 307 Phone Number for Business

A 307 phone number instantly signals local presence and trust, which is essential for businesses looking to connect with Wyoming customers. It helps build credibility, improves response rates, and fosters stronger relationships with the community. 

1. Local Presence

Using a 307 number allows businesses to appear local, even if they’re operating remotely. This local presence builds instant rapport and comfort with Wyoming-based customers. It gives your brand a “neighborly” identity, which can be especially valuable in close-knit communities. Customers are more likely to engage with businesses they believe are part of their region.

2. Gain Trust

People are more likely to answer calls from numbers they recognize. In fact, local area codes like 307 can increase answer rates for sales and support teams. Familiarity breeds trust, and trust leads to better customer interactions. This can directly improve your conversion rates and customer satisfaction scores.

3. Enhance Marketing Campaigns

Geo-targeted marketing becomes more effective when tied to a local number. From SMS campaigns to call tracking, a 307 number sharpens your focus on Wyoming customers. It helps you tailor your messaging to local preferences and behaviors. This hyper-local approach can result in higher engagement and better ROI on your campaigns.

4. Strengthen Brand Image

A 307 area code aligns your brand with Wyoming’s values, authenticity, trust, and community. It’s an easy way to signal that your business understands and serves local needs. Being associated with a respected local code enhances your credibility. Over time, this can position your brand as a trusted and reliable part of the community.

How to Get a 307 Phone Number (With CallHippo)?

CallHippo makes it easy to purchase a 307 phone number and activate it in minutes.

Step 1: Sign up at CallHippo.com

Step 2:  Select the U.S. as your country and search for the 307 area code

Step 3:  Choose a business plan

Step 4:  Complete payment and activate your number

Step 5: Start calling via the CallHippo app, desktop, or browser dashboard

Once activated, use your CallHippo number to manage calls, track performance, and engage customers with features like call routing, analytics, and real-time call monitoring.

Ready To Establish a Local Presence in the Wyoming?

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Top Features to Look for While Selecting a 307 Area Code Number

Choosing a virtual phone number with the 307 area code isn’t just about location; it’s about selecting the right features to optimize business communication, enhance customer experience, and streamline operations. Here are the top features to look for when choosing a VoIP provider or phone service.

• On Hold Music: Play custom music or messages to keep callers engaged and reduce hang-ups during wait times.
• Call Recording: Automatically record calls for training, compliance, and quality assurance; access anytime from your dashboard.
• Local Presence Dialing: Use a 307 area code to increase call answer rates and build trust with Wyoming-based customers.
• Call Forwarding: Redirect incoming calls to any device or team member to stay connected wherever you are.
• Call Routing: Automatically route calls based on rules like time, language, or priority to ensure faster, accurate responses.
• Real-time Call Transcription: Convert calls into searchable text instantly for better documentation and customer insight.
• Voicemail: Get personalized greetings and receive voicemails via inbox, email, or text even outside working hours.

Conclusion

The 307 area code isn’t just about location; it’s about connection. For businesses and individuals alike, it represents local authenticity, reliability, and an opportunity to thrive in one of the most unique regions in the U.S. Whether you’re starting a business in Wyoming or targeting local clients, securing a 307 phone number gives your brand a homegrown feel with nationwide capabilities.

FAQs

1. Can I use my 307 number on multiple devices?

Yes, most VoIP providers like CallHippo allow you to access your number across desktop, mobile, and web apps.

2. Are there any limitations on calls and texts with a 307 area code number?

No, once activated, your number can make and receive unlimited calls/texts based on your selected plan.

3. Do I need to have a physical address in Wyoming to get a 307 number?

No, you can get a 307 number from anywhere, even if your business is located outside of Wyoming.

4. Is there an overlay for the 307 area code?

No, 307 is still the only area code used in Wyoming.

5. How can I avoid phone scams in the 307 area code?

Be cautious of unknown callers, use spam filters, and verify identities before sharing personal info.

6. What are the Wyoming local area codes?

Wyoming only uses one: the 307 area code.

7. Can I port my existing 307 number to CallHippo?

Yes, number porting is supported. Just provide the necessary documentation during the process.

Published : July 15, 2025

Supriya Bajaj

Supriya Bajaj is a senior content developer with immense experience in the VoIP telephony domain. With a deep knowledge of VoIP systems and emerging technologies in the field, she provides insightful and targeted content. Known for simplifying complex topics and her thought-leadership articles, Supriya delivers actionable content for both technical and non-technical audiences.

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