www.trentonnj.org Trenton is the capital of the U.S. state of New Jersey and the county seat of Mercer County. As of the 2010 United States Census, Trenton had a population of 84,913, making it the state's 10th-largest municipality, having seen a decline of 490 residents (-0.6%) from its population of 85,403 in the 2000 Census, when it was the state's ninth-largest municipality. The city is part of the Delaware Valley and the Greater New York City Combined Statistical Area. Trenton dates back at least to June 3, 1719, when mention was made of a constable being appointed for Trenton, while the area was still part of Hunterdon County. Boundaries were recorded for Trenton Township as of March 2, 1720, a courthouse and jail were constructed in Trenton around 1720 and the Freeholders of Hunterdon County met annually in Trenton. Trenton became New Jersey's capital as of November 25, 1790, and the City of Trenton was formed within Trenton Township on November 13, 1792. Trenton Township was incorporated as one of New Jersey's initial group of 104 townships by an Act of the New Jersey Legislature on February 21, 1798. Portions of the township were taken on February 22, 1834, to form Ewing Township. A series of annexations took place over a 50-year period, with the city absorbing South Trenton borough (April 14, 1851), portions of Nottingham Township (April 14, 1856), Chambersburg and Millham Township (both on March 30, 1888) and Wilbur borough (February 28, 1898).