Neighborhood Guides Buyers Resource Renter Resource Mortgage Calculator Glossary of Terms Click here to sign-up Neighborhood Guides > Jersey City 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. History Government Education Neighborhoods Geography Demographics Transportation Street alignments Noteworthy residents Trivia