Greenport is a town in Columbia County, New York, United States. The population was 4,165 at the 2010 census. The town is on the western border of the county and surrounds the city of Hudson on three sides. US 9 passes through the town.

Columbia County is a county in the U.S. state of New York. At the 2020 census, the population was 61,570. The county seat is Hudson. The name comes from the Latin feminine form of the surname of Christopher Columbus, which was at the time of the formation of the county a popular proposal for the name of the United States. The county is part of the Capital District region of the state.