Polk County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 50,123. Its county seat is Livingston. The county is named after James K. Polk. The Alabama-Coushatta Indian Reservation of the federally recognized tribe is in Polk County, where the people have been since the early 19th century. They were forcibly evicted by the federal government from their traditional territory in the Southeast.