Leesburg is an unincorporated community in Lemhi County, Idaho, United States. It lies at 45°13′26″N 114°6′50″W / 45.22389°N 114.11389°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. Little remains of the original community. The entire site has been listed on the National Register of Historic Places since 1975.