West Trenton is a section of Ewing Township in Mercer County, New Jersey, United States. It is a suburban area located adjacent to the northwestern portion of the city of Trenton, from which it derives its name. Located at the intersection of Bear Tavern Road/Grand Avenue and West Upper Ferry Road, it is one of the oldest settlements in Ewing Township. The community was known as Birmingham and then Trenton Junction before adopting its current name.