Morris County is a county in the U.S. state of New Jersey, close to New York City. As of 2017, there was 499,693 people living in the county. This made it the 10th-most populous county in New Jersey. The county seat is Morristown. The place where most people live at is Parsippany-Troy Hills Township, with 53,238 people, while the largest place is Rockaway Township, at .