Ider is a town in DeKalb County, Alabama, United States. At the 2020 census, the population was 735. It incorporated in October 1973. Ider is located at 34°42′14″N 85°40′26″W / 34.70389°N 85.67389°W. The town is situated atop Sand Mountain, a few miles west of the Alabama-Georgia state line. Alabama State Route 75 and Alabama State Route 117 int…Ider is a town in DeKalb County, Alabama, United States. At the 2020 census, the population was 735. It incorporated in October 1973. Ider is located at 34°42′14″N 85°40′26″W / 34.70389°N 85.67389°W. The town is situated atop Sand Mountain, a few miles west of the Alabama-Georgia state line. Alabama State Route 75 and Alabama State Route 117 intersect in Ider.