Parsippany-Troy Hills Township, commonly calle simply Parsippany, is a Township in Morris County, New Jersey, United States. As of the United States 2000 Census, the township population was 50,649. The name Parsippany comes from the Lenape Native American word parsipanong, which means "the place where the river winds through the valley." Parsippany-Troy Hills is the most populous municipality in Morris County.