Leesburg is an unincorporated community in Lemhi County, Idaho, United States. It lies at (45°13′26″N114°6′50″W) (45.2238080, -114.1139647), along Napias Creek in the Salmon National Forest, west of Salmon. Its altitude is 6,653 feet (2,028 m). The community possessed a post office as late as 1942, but it has since closed.