Trenton is a city in Wayne County, Michigan, United States. At the 2010 census, the city population was 18,853. A Shawnee village was built in the area by war chief Blue Jacket after the 1795 Treaty of Greenville. The area later became the site of the Battle of Monguagon between Americans and a British-Indian coalition during the War of 1812. The battle is commemorated with a Michigan State Historical Site marker in present-day Elizabeth Park, which was the first county park in Michigan when it was established in 1919. Portions of the Detroit River International Wildlife Refuge are within the southern portion of Trenton.