Trenton is a city and the only incorporated municipality in Dade County, Georgia, United States—and as such, it serves as the county seat. T…Trenton is a city and the only incorporated municipality in Dade County, Georgia, United States—and as such, it serves as the county seat. The population was 2,195 at the 2020 census. Trenton is part of the Chattanooga, Tennessee–GA Metropolitan Statistical Area.