Alder Map
Alder is a census-designated place (CDP) in Madison County, Montana, United States. The population was 116 at the 2000 census. Alder takes its name from Alder Creek (named by Henry Edgar in 1863), the site of the second major gold discovery in Montana.
Alder is located at 45°19?28?N 112°6?29?W / 45.32444°N 112.10806°W / 45.32444; -112.10806 (45.324531, -112.108035).
According to the United States Census Bureau, the CDP has a total area of 2.0 square miles (5.2 km²), all of it land.
Nearby cities include Sheridan, Ennis, Twin Bridges, Virginia City.