Where Is Area Code 307?
Area code 307 serves the entire state of Wyoming in the Mountain West region of the United States. Casper, the primary city, is in Natrona County. The code also covers Cheyenne, Laramie, Gillette, Rock Springs, Sheridan, Green River, Jackson, Cody, and many smaller communities.
Area code 307 covers all 23 Wyoming counties, including urban, rural, and remote areas. Its geographic footprint includes Wyoming’s portion of Yellowstone National Park, Grand Teton National Park, the Wind River Range, the Bighorn Mountains, and the state’s Great Plains.
Cities and Communities in the 307 Area Code
- Afton, Lincoln County
- Basin, Big Horn County
- Big Piney, Sublette County
- Buffalo, Johnson County
- Casper, Natrona County
- Cheyenne, Laramie County
- Cody, Park County
- Douglas, Converse County
- Evanston, Uinta County
- Gillette, Campbell County
- Glenrock, Converse County
- Green River, Sweetwater County
- Greybull, Big Horn County
- Jackson, Teton County
- Kemmerer, Lincoln County
- Lander, Fremont County
- Laramie, Albany County
- Lusk, Niobrara County
- Lyman, Uinta County
- Newcastle, Weston County
- Pinedale, Sublette County
- Powell, Park County
- Rawlins, Carbon County
- Riverton, Fremont County
- Rock Springs, Sweetwater County
- Saratoga, Carbon County
- Sheridan, Sheridan County
- Shoshoni, Fremont County
- Sundance, Crook County
- Ten Sleep, Washakie County
- Thermopolis, Hot Springs County
- Torrington, Goshen County
- Wamsutter, Sweetwater County
- Wheatland, Platte County
- Worland, Washakie County
- Wright, Campbell County
History of Area Code 307
Area code 307 was established in 1947 as one of the original North American Numbering Plan area codes. It was assigned to Wyoming from the beginning, so it was not created by splitting an older Wyoming area code.
Area code 307 remains Wyoming’s only statewide area code. Wyoming has not been divided into multiple area codes, and 307 has no overlay. The same code continues to cover Casper, other cities, small towns, and rural communities across the state.
Key Facts About Area Code 307
- Area code 307 is a geographic area code assigned to Wyoming.
- Casper in Natrona County is the primary city associated with area code 307.
- Area code 307 was created in 1947 as an original North American Numbering Plan code.
- Area code 307 covers all 23 counties in Wyoming.
- Wyoming had 576,851 residents in the 2020 U.S. Census, the population within area code 307’s statewide geographic footprint.
- Area code 307 uses Mountain Time.
- The University of Wyoming is in Laramie, and Casper College is in Casper, both within the 307 footprint.
- Area code 307 has no split or overlay and remains Wyoming’s only area code.
Frequently Asked Questions
What state is area code 307 in?
Area code 307 is in Wyoming, in the Mountain West region of the United States.
What major cities use area code 307?
Major cities include Casper, Cheyenne, Laramie, Gillette, Rock Springs, Sheridan, Green River, Evanston, Riverton, Jackson, Cody, and Rawlins.
What time zone is area code 307 in?
Area code 307 uses Mountain Time.
Is area code 307 a toll-free number?
No. Area code 307 is a geographic area code assigned to Wyoming, not a toll-free code.