Area code 307 spans the entire state of Wyoming and remains one of the few area codes serving an entire U.S. state without overlays or splits. Established in 1947, it includes notable cities like Cheyenne, Casper, and Laramie. Jackson, located near Grand Teton National Park, is a standout within the 307 region. Known for its stunning mountain views, wildlife, and luxury resorts, Jackson is a gateway to both natural beauty and Western culture, drawing visitors year-round for skiing, hiking, and fine dining.