Chattahoochee County, also known as Cusseta-Chattahoochee County, is a county located on the western border in central Georgia. As of the 2020 census, the population was 9,565. The county seat is Cusseta, with which the county shares a consolidated city-county government. The city of Cusseta remains a geographically distinct municipality within Chattah…Chattahoochee County, also known as Cusseta-Chattahoochee County, is a county located on the western border in central Georgia. As of the 2020 census, the population was 9,565. The county seat is Cusseta, with which the county shares a consolidated city-county government. The city of Cusseta remains a geographically distinct municipality within Chattahoochee County. The county was created on February 13, 1854.