Northampton is a hamlet and census-designated place (CDP) in Suffolk County, New York, United States on Long Island. The CDP population was 570 at the 2010 census.

Southampton, officially the Town of Southampton, is a town in southeastern Suffolk County, New York, partly on the South Fork of Long Island. As of the 2020 U.S. census, the town had a population of 69,036. Southampton is included in the stretch of shoreline prominently known as the Hamptons.