Jersey City is a city in Hudson County, New Jersey, United States. As of the United States 2000 Census, the city population was 240,055, making it New Jersey's second-largest city, trailing Newark. It is the county seat of Hudson County^GR6.

Jersey City lies on the west bank of the Hudson River across from New York City, and is part of the New York metropolitan area. The second largest city in the state and a commercial and industrial center surpassed only by Newark, it is a port of entry and a manufacturing center. With 11 miles (17.7 km) of waterfront and significant rail connections, Jersey City is an important transportation terminus and distribution center. It has railroad shops, oil refineries, warehouses, and plants that manufacture a diverse assortment of products, such as chemicals, petroleum and electrical goods, textiles, and cosmetics. Jersey City has benefited from its position across the Hudson River from the island of Manhattan, and many of its companies are extensions of businesses headquartered there. Recent developments have included increased housing and shopping areas; other parts of the city, however, remain run-down after years of commercial inactivity.

Jersey City is one of the most ethnically and culturally diverse cities in the country, with an almost equal mix of non-Hispanic whites, non-Hispanic blacks, Asians, and Latinos. Of all cities in the United States, it has one of the largest Arab and Muslim populations and proportions, one of the largest Asian proportions, and one of the largest proportions of various Latino and Hispanic ethnicities outside the southwest. It also has higher-than-average numbers of Jews, Italians, Cubans, Filipinos, Indians, and Irish than most cities in the nation.