Teton County, Wyoming

Teton County
Location within the U.S. state of Wyoming
Wyoming's location within the U.S.
Coordinates: 43°55′N 110°34′W / 43.92°N 110.57°W / 43.92; -110.57
Country United States
State Wyoming
FoundedFebruary 15, 1921 (authorized)
1922 (organized)
Named afterTeton Range
SeatJackson
Largest townJackson
Area
  Total
4,216 sq mi (10,920 km2)
  Land3,995 sq mi (10,350 km2)
  Water221 sq mi (570 km2)  5.2%
Population
 (2020)
  Total
23,331
  Estimate 
(2024)
23,272
  Density5.5/sq mi (2.1/km2)
Time zoneUTC−7 (Mountain)
  Summer (DST)UTC−6 (MDT)
Congressional districtAt-large

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. Teton County contains the Jackson Hole ski area, all of Grand Teton National Park, and 40.4% of Yellowstone National Park's total area, including over 96.6% of its water area (largely in Yellowstone Lake).