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is a hamlet (and census-designated place) in Suffolk County, New York, United States. The population was 1,526 at the 2000 census. Jamesport is known for its quaint downtown area including antique shops and handful of fine restaurant's. The population of the hamlet grows considerably during the summer months due to the influx of day-tourists and vacationers taking advantage of the Great Peconic Bay beaches located on the south side of the hamlet. During the late summer/fall months, the hamlet is busy once again, due to "pumpkin pickers" and "wine tasters", and other tourists taking in the beautiful fall scenery Jamesport has to offer. Jamesport is home to many farms including sod, pumpkin, flower, potato and wineries. Also Jamesport is home to the newest New York State park, Jamesport State Park.
According to the United States Census Bureau, the CDP has a total area of 7.7 square miles (20.0 km²), of which, 4.4 square miles (11.4 km²) of it is land and 3.3 square miles (8.6 km²) of it (42.82%) is water.