Resident Population in Brown County, SD was 37.73300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Brown County, SD reached a record high of 39.33200 in January of 2017 and a record low of 34.95200 in January of 2003. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Brown County, SD - last updated from the United States Federal Reserve on May of 2024.