Teton County is a county located in the U.S. state of Idaho. As of the 2020 census, the population was 11,630. The county seat is Driggs, and the largest city is Victor. The county was established in 1915 and was named after the Teton Mountains to the east. Teton County is part of the Jackson, WY-ID Micropolitan Statistical Area. The Teton Valley was discovered by John Colter in 1808, a member of the Lewis and Clark Expedition.