Resident Population in Adair County, OK was 19.62700 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Adair County, OK reached a record high of 22.76000 in January of 2010 and a record low of 15.14100 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Adair County, OK - last updated from the United States Federal Reserve on May of 2024.