Resident Population in McPherson County, KS was 30.33400 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in McPherson County, KS reached a record high of 30.33400 in January of 2024 and a record low of 24.50000 in January of 1972. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in McPherson County, KS - last updated from the United States Federal Reserve on April of 2026.