Kingston is the only city in, and the county seat of, Ulster County, New York, United States. It is 91 miles north of New York City and 59 mile…Kingston is the only city in, and the county seat of, Ulster County, New York, United States. It is 91 miles north of New York City and 59 miles south of Albany. The city's metropolitan area is grouped with the New York metropolitan area around Manhattan by the United States Census Bureau. The population was 24,069 at the 2020 United States Census.