Trenton is a city in Dade County, Georgia, United States. Founded in the 1830s, the area was originally known as Salem. In 1839 Salem was designated the seat of the newly formed Dade County. It was renamed Trenton in 1841. The population was 2,301 at the 2010 census. It is the only incorporated municipality in the county, and as such it serves as the county seat. Trenton is part of the Chattanooga, Tennessee?GA Metropolitan Statistical Area.