Resident Population in Sully County, SD was 1.49400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Sully County, SD reached a record high of 2.36200 in January of 1970 and a record low of 1.34600 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Sully County, SD - last updated from the United States Federal Reserve on May of 2024.