Resident Population in Major County, OK was 7.58100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Major County, OK reached a record high of 9.72400 in January of 1982 and a record low of 7.13100 in January of 2008. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Major County, OK - last updated from the United States Federal Reserve on May of 2024.