Resident Population in Johnston County, OK was 10.21600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Johnston County, OK reached a record high of 11.13300 in January of 2017 and a record low of 7.87000 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Johnston County, OK - last updated from the United States Federal Reserve on May of 2024.