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 State Police local law enforcement efforts, maintenance of criminal records and identification systems and regulation of certain commerce such as firearms ownership. Many municipalities in southern and north-western New Jersey lack local police departments, therefore the state police have the primary responsibility for providing police services to these towns for a yearly assessed nominal fee paid to the state government. The New Jersey State Police is also charged with the responsibility of protecting the Governor of New Jersey and Lieutenant Governor of New Jersey, as well as the President of the New Jersey Senate and the Speaker of the New Jersey General