Paterson is a city in Passaic County, New Jersey, United States. 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 incorporated as a city in 1851; it was reincorporated in 1861. Downtown Paterson is home to City Hall and the Passaic County Courthouse Annex, two of the city's architectural landmarks. The Eastside Park Historic District is a state and nationally-registered historic place. The jewel of the neighborhood is Eastside Park and the mansions that surround it. Eastside Park and what is commonly known as the Upper Eastside is located in Paterson's 3rd Ward.