Resident Population in Stanley County, SD was 3.04300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Stanley County, SD reached a record high of 3.12900 in January of 2019 and a record low of 2.35000 in January of 1982. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Stanley County, SD - last updated from the United States Federal Reserve on May of 2024.