Trenton is a city in Gibson County, Tennessee, United States. The population was 4,264 at the 2010 census. It is the county seat of Gibson County, and its third largest city.
Trenton is located at 35°58′25″N 88°56′30″W / 35.97361°N 88.94167°W / 35.97361; -88.94167 (35.973627, -88.941569).
According to the United States Census Bureau, the city has a total area of 5.6 square miles (14.4 km²), of which, 5.5 square miles (14.3 km²) of it is land and 0.1 square miles (0.1 km²) of it (0.90%) is water.