Resident Population in Oklahoma County, OK was 808.86600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Oklahoma County, OK reached a record high of 808.86600 in January of 2023 and a record low of 527.71700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Oklahoma County, OK - last updated from the United States Federal Reserve on May of 2024.