Rushmore is a town in Nobles County, Minnesota, United States. The population was 365 at the 2020 census. According to the United Stat…Rushmore is a town in Nobles County, Minnesota, United States. The population was 365 at the 2020 census. According to the United States Census Bureau, the city has a total area of 0.25 square miles, all land. Rushmore is located in section 19 of Dewald Township. It is situated on the Buffalo Ridge, a drainage divide between the Mississippi and Missouri River systems.