Gillette, Wyoming, is served by area code 307. Whether you are calling a Gillette number, verifying an unknown caller, or setting up a new local line, this guide covers every area code that serves the city, how local dialing works, the ZIP codes involved, and the scam-call patterns residents report most often.
Gillette Area Codes at a Glance
| Detail | Information |
|---|---|
| Primary Area Code | 307 |
| Overlay Code | None currently active |
| Time Zone | Mountain Time (MT, UTC-7 / UTC-6) |
| Major Counties | Campbell County |
| State | Wyoming |
Area Code Breakdown & Neighborhood Mapping
Gillette sits in the Powder River Basin of northeastern Wyoming, which is served entirely by area code 307. A single area code has covered this area without needing a split or overlay, so a 307 number reads clearly as a local line.
Within the city, 307 covers downtown, the CAM-PLEX events district, and the residential neighborhoods serving the coal-and-energy industry. Nearby communities in the same region include Sheridan.
Across Wyoming, 307 connects to the rest of the state through standard long-distance dialing, and every call to or from Gillette follows the same North American Numbering Plan rules used nationwide. Knowing which code covers the city helps you spot out-of-area numbers at a glance and recognize when an incoming call may not be as local as it appears.
Local Dialing Rules & International Calling
Like the rest of the United States, Gillette uses 10-digit dialing. Dial the area code plus the seven-digit number for local calls. For domestic long distance, add a leading 1 (1 + 307 + number). To call Gillette from another country, dial your country’s exit code, then the U.S. country code +1, then the area code and the local number. Mobile users can enter +1 307 directly. Three-digit services such as 911 for emergencies and 988 for the Suicide and Crisis Lifeline are always dialed directly, with no area code required.
Major ZIP Codes in Gillette
Gillette ZIP codes include 82716 and 82718, covering the central and southern parts of the city.
Cell Phones & Number Portability
Thanks to federal number portability, a 307 number no longer proves the caller is currently in Gillette. Residents who move away often keep their mobile numbers, and newcomers frequently arrive with codes from other states. New local service is typically assigned a 307 number, but the reliable habit is to dial all ten digits every time and to judge callers by who they are rather than by the area code they display.
Spam & Scam Call Warnings in Gillette
Gillette residents report the same robocall trends seen across Wyoming. Watch for these patterns:
- Neighbor spoofing: Scam calls that fake a 307 prefix so the number looks local. Screen unfamiliar callers even when the area code matches.
- Utility shutoff threats: Callers posing as the power or water company demanding immediate payment by gift card or wire. Real utilities never work this way.
- Government impersonation: Fake IRS, Social Security, or county “warrant” calls pressuring you to pay to avoid arrest.
- Local angle: In this Powder River Basin energy hub, watch for fake job-offer and equipment-buyer scams that request personal information or upfront fees before a promised position.
- Auto-warranty and Medicare pitches: High-volume robocalls seeking personal, financial, or insurance details, often using a recorded voice and a callback number.
Let unknown calls go to voicemail, never share financial information with an inbound caller, and report unwanted calls to the FTC at reportfraud.ftc.gov.
Frequently Asked Questions
What area code does Gillette use?
Gillette uses area code 307.
Do I have to dial the area code for local calls?
Yes. Gillette uses 10-digit dialing, so include the area code even for calls within the city.
What county is Gillette in?
Gillette is located in Campbell County.
What time zone is Gillette in?
Gillette observes Mountain Time (MT, UTC-7 / UTC-6).
How do I call Gillette from another country?
Dial your exit code, then +1, then 307 and the seven-digit local number.
Does the area code affect the cost of a call?
No. Call costs depend on your calling plan, not on the 307 area code. Most U.S. mobile and landline plans include nationwide calling, so reaching a Gillette number is treated the same as any other domestic call.
Can I keep my phone number if I move to Gillette?
Usually yes. Federal number portability lets you keep an existing mobile number when you relocate, which is why many Gillette residents carry numbers with area codes from other cities or states.
Stay Safe & Explore More
- Verify an unknown caller in our Scam Alerts directory.
- Comparing nationwide numbers? See our Toll-Free Numbers guides.