Morris County is a county located in the U.S. state of New Jersey, about 25 mi (40 km) west of New York City. According to the 2010 United States Census, the population was 492,276, up from the 470,212 at the 2000 Census, retaining its status as the tenth-most populous county in the state; since 2010, Morris County's population has increased by 1.5% to a Census-estimated 499,509 in 2015. The county is part of the New York Metropolitan Area, and its county seat is Morristown. The most populous place was Parsippany-Troy Hills Township, with 53,238 residents at the time of the 2010 Census, while Rockaway Township, covered 45.55 square miles (118.0 km2), the largest total area of any municipality.