Interstate 78 in New Jersey Interstate 78 in New Jersey Interstate 78 (I-78) is an east–west route stretching from Union Township, Lebanon County, Pennsylvania to New York City. In New Jersey, I-78 is called the Phillipsburg–Newark Expressway and the Newark Bay Extension of the New Jersey Turnpike. The highway runs for in the northern part of the state of New Jersey from the Interstate 78 Toll Bridge over the Delaware River at the Pennsylvania state line in Phillipsburg, Warren County east to the Holland Tunnel under the Hudson River at the New York state line in Jersey City, Hudson County. The Phillipsburg-Newark Expressway portion of
Jersey City, New Jersey Jersey City, New Jersey 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 2017, the Census Bureau's Population Estimates Program calculated that Jersey City's population was 270,753, 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 75th-most-populous in the nation. Part of the New York metropolitan area, Jersey City is bounded on