Resident Population in Buffalo County, SD was 1.88400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Buffalo County, SD reached a record high of 2.12200 in January of 2008 and a record low of 1.60600 in January of 1984. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Buffalo County, SD - last updated from the United States Federal Reserve on May of 2024.