Pontotoc County is a county in the south central part of Oklahoma. As of the 2020 census, the population was 38,065. Its county seat is Ada. The county was created at statehood from part of the Chickasaw Nation in Indian Territory. It was named for a historic Chickasaw tribal area in Mississippi. According to the Encyclopedia of Oklahoma History and Culture, Pontotoc is usually translated "cattail prairie" or "land of hanging grapes."