Paterson is a city in Passaic County, New Jersey, United States. As of the United States 2000 Census, the city population was 149,222. Census population projections indicate a population of 146,545 as of 2007, making it New Jersey's third largest city. It is the county seat of Passaic County. Paterson is known as the "Silk City" for its dominant role in silk production during the later 19th century. Paterson was originally formed as a township from portions of Acquackanonk Township on April 11, 1831, while the area was still part of Essex County. Paterson became part of the newly-created Passaic County on February 7, 1837. Paterson was incorporated as a city on April 14, 1851, based on the results of a referendum held that day. The city was reincorporated on March 14, 1861.