Resident Population in Douglas County, KS was 120.55300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Douglas County, KS reached a record high of 122.26900 in January of 2019 and a record low of 57.93200 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Douglas County, KS - last updated from the United States Federal Reserve on May of 2024.