Ellendale is a city in Steele County, Minnesota, United States. The population was 691 at the 2010 census. Ellendale was platted in 190…Ellendale is a city in Steele County, Minnesota, United States. The population was 691 at the 2010 census. Ellendale was platted in 1900, and named for Ellen Dale Ives, the wife of a railroad official. A post office has been in operation at Ellendale since 1901.