Resident Population in Bennett County, SD was 3.30500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Bennett County, SD reached a record high of 3.60900 in January of 2000 and a record low of 3.01400 in January of 1981. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Bennett County, SD - last updated from the United States Federal Reserve on May of 2024.