Jersey City is the second-most populous city in the U.S. state of New Jersey, after Newark. It is the seat of Hudson County as well as the county's largest city. As of 2018, the Census Bureau's Population Estimates Program calculated that Jersey City's population was 265,549, with the largest population increase of any municipality in New Jersey since 2010, an increase of about 9.4% from the 2010 United States Census, when the city's population was at 247,597, ranking the city the 78th-most-populous in the nation.