Resident Population in Fall River County, SD was 7.39300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Fall River County, SD reached a record high of 8.43900 in January of 1980 and a record low of 6.68800 in January of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Fall River County, SD - last updated from the United States Federal Reserve on May of 2024.