Area Code 307
307 area code is being used for dialing/telecommunication purposes in Wyoming, covering 5 major cities and 24 counties, according to (NANP) North American Numbering Plan for 3-digit Numbering Plan Area (NPA) code. All the areas using NPA code 307 is part of MST (Mountain Standard Time) timezone.
307 Area Code Covers 5 Cities
Check this below table to know 5 major cities (having more than 20,000 population) in Wyoming using numbering plan area code 307 for dialing/telecommunication purposes.
| City | ZIP Codes | Population |
|---|---|---|
| Casper, WY | 10 | 58,631 |
| Cheyenne, WY | 10 | 64,795 |
| Gillette, WY | 3 | 33,158 |
| Laramie, WY | 6 | 31,735 |
| Rock Springs, WY | 3 | 23,361 |
24 Counties Using 307 as Area Code
307 area code is being used in 24 counties of Wyoming for dialing/telecommunication purposes.
- Albany County, WY
- Big Horn County, WY
- Campbell County, WY
- Carbon County, WY
- Converse County, WY
- Crook County, WY
- Fremont County, WY
- Goshen County, WY
- Hot Springs County, WY
- Johnson County, WY
- Laramie County, WY
- Lincoln County, WY
- Natrona County, WY
- Niobrara County, WY
- Park County, WY
- Platte County, WY
- Sheridan County, WY
- Sublette County, WY
- Sweetwater County, WY
- Teton County, WY
- Uinta County, WY
- Washakie County, WY
- Weston County, WY
14 More NPA Codes Related to Area Code 307
1 or more of these 14 NPA codes are being used in the same or adjacent states of Wyoming in the United States.
- 208 Area Code
- 303 Area Code
- 308 Area Code
- 385 Area Code
- 402 Area Code
- 406 Area Code
- 435 Area Code
- 531 Area Code
- 605 Area Code
- 719 Area Code
- 720 Area Code
- 801 Area Code
- 970 Area Code
- 986 Area Code