Resident Population in Cleveland County, OK was 301.19300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Cleveland County, OK reached a record high of 301.19300 in January of 2023 and a record low of 81.83900 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Cleveland County, OK - last updated from the United States Federal Reserve on May of 2024.