Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in McClain County, OK was 410.00000 Persons in January of 2022, according to the United States Federal Reserve. Historically, Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in McClain County, OK reached a record high of 450.00000 in January of 2020 and a record low of 25.00000 in January of 2010. Trading Economics provides the current actual value, an historical data chart and related indicators for Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in McClain County, OK - last updated from the United States Federal Reserve on May of 2024.