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Jackson, town, seat (1921) of Teton county, northwestern Wyoming, U.S. The town lies at the southern end of Jackson Hole, a fertile valley from which the Teton Range rises steeply to the west. The Snake River skirts the town about 4 miles (6 km) to the west. Jackson is a major destination for tourists and outdoor-recreation enthusiasts. The region was first explored in 1807 by the fur trapper John Colter, a member of the Lewis...