Fort Bridger was originally a 19th-century fur trading outpost established in 1842, on Blacks Fork of the Green River, in what is now Uinta County, Wyoming, United States. It became a vital resupply point for wagon trains on the Oregon Trail, California Trail, and Mormon Trail. The Army established a military post here in 1858 during the Utah War, until it was finally closed in 1890. A small town, Fort Bridger, Wyoming, remains near the fort and takes its name from it.

Uinta County is a county in the U.S. state of Wyoming. As of the 2020 United States Census, the population was 20,450. Its county seat is Evanston. Its south and west boundary lines abut the Utah state line.