The Aberdeen Micropolitan Statistical Area, as defined by the United States Census Bureau, is an area consisting of two counties in South Dakota, anchored by the city of Aberdeen. As of the 2020 census, the μSA had a population of 42,287.

Brown County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 38,301, making it the fourth most populous county in South Dakota. Its county seat is Aberdeen. The county is named for Alfred Brown, of Hutchinson County, South Dakota, a Dakota Territory legislator in 1879.