Teton County is a county in the U.S. state of Wyoming. As of the 2020 United States Census, the population was 23,331. Its county seat is Jackson. Its west boundary line is also the Wyoming state boundary shared with Idaho and the southern tip of Montana. Teton County is part of the Jackson, WY-ID Micropolitan Statistical Area.

Jackson is a town in Teton County, Wyoming, United States. The population was 10,760 at the 2020 census, up from 9,577 in 2010. It is the largest town in Teton County and its county seat. Jackson is the principal town of the Jackson, WY-ID Micropolitan Statistical Area, which includes Teton County in Wyoming and Teton County in Idaho. The town, often familiarly or mistakenly called Jackson Hole, derives its name from the valley in which it is located. Jackson is a popular tourist destination due to its proximity to the ski resorts Jackson Hole Mountain, Snow King Mountain, and Grand Targhee, as well as Grand Teton National Park and Yellowstone National Park.