Resident Population in Douglas County, SD was 2.83800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Douglas County, SD reached a record high of 4.60000 in January of 1971 and a record low of 2.77600 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Douglas County, SD - last updated from the United States Federal Reserve on May of 2024.