Resident Population in McPherson County, SD was 2.33400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in McPherson County, SD reached a record high of 5.02200 in January of 1970 and a record low of 2.33400 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in McPherson County, SD - last updated from the United States Federal Reserve on May of 2024.