Trenton, New Jersey Trenton, New Jersey Trenton is the capital city of the U.S. state of New Jersey and the county seat of Mercer County. It was briefly the capital of the United States. The city's metropolitan area is grouped with the New York metropolitan area by the United States Census Bureau, but directly borders the Philadelphia metropolitan area and is part of the Philadelphia Combined Statistical Area and the Federal Communications Commission's Philadelphia Designated Market Area. As of the 2010 United States Census, Trenton had a population of 84,913, making it the state's 10th-most-populous municipality. The Census Bureau estimated that the city's
New Jersey Department of Transportation of NJDOT-owned and operated roads (as of July 2015). Most major highways including Interstate, U.S. and NJ State routes within New Jersey are under NJDOT jurisdiction, except toll routes including the New Jersey Turnpike, Garden State Parkway (under the New Jersey Turnpike Authority) and the Atlantic City Expressway as well as the interstate toll bridges and tunnels. NJDOT develops interim and long-term plans and strategic policy on freight and shipping in and around the state. These intermodal policies cover trucking, rail, maritime and air freight. The Transportation Capital Program and the Statewide Transportation Improvement Program (STIP) allocate state and federal