Aberdeen is a city in and the county seat of Brown County, South Dakota, United States, located approximately 125 miles northeast of Pierre. The city population was 26,091 at the 2010 census, making it the third most populous city in the state after Sioux Falls and Rapid City. Aberdeen is the principal city of the Aberdeen Micropolitan Statistical Area, which includes all of Brown and Edmunds counties and has a population of 40,602 in 2010. Aberdeen is considered a college town, being the home of both Northern State University and Presentation College.