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 Guard equipped by various individual cities, into the state's military command structure by designating such units as a part of the New Jersey State Militia Reserve. These additional forces were given official legislative recognition in 1918, and by 30 June 1918, consisted of 84 units of Home Guard, with a total strength of 6,420 men. The New Jersey State Guard was reactivated in 1941 by executive order. By the end of December 1941, the New Jersey State Guard was on continuous duty. During World War II, the State Guard was charged primarily with the protection of vital installations, such as bridges,