Harris County is a county located in the west-central portion of the U.S. state of Georgia; its western border with the state of Alabama is formed by the Chattahoochee River. As of the 2020 census, the population was 34,668. The county seat is Hamilton. The largest city in the county is Pine Mountain, a resort town that is home to the Franklin D. Roosevelt State Park. Harris County was created on December 14, 1827, and named for Charles Harris, a Georgia judge and attorney.