West Trenton is an unincorporated community within 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 settlemen…West Trenton is an unincorporated community within 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.