Morristown is a town in St. Lawrence County, New York, United States. The population was 2,050 at the 2000 census. The town is named after Gouverneur Morris, a signer of the United States Declaration of Independence and land owner in New York. Morristown apartments for rent comparison page shows most up to date rent information on Morristown apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.