Trenton is a small city in Wayne County in the southeast portion of the U.S. state of Michigan. At the 2010 census, the city population was 18,853. The city is part of Downriver, a collection of mostly blue-collar communities south of Detroit on the west bank of the Detroit River.Many residents are employed in the city's factories such as the Chrysler Trenton Engine Plant, Solutia, and the Trenton Channel Power Plant.