Yaphank is a hamlet and census-designated place in Suffolk County, New York, United States. The population was 5,945 at the time of the 2010 census. Yaphank is located in the south part of the Town of Brookhaven. It is served by the Longwood Central School District, except for extreme southwestern Yaphank, which is served by the South Country Centra…Yaphank is a hamlet and census-designated place in Suffolk County, New York, United States. The population was 5,945 at the time of the 2010 census. Yaphank is located in the south part of the Town of Brookhaven. It is served by the Longwood Central School District, except for extreme southwestern Yaphank, which is served by the South Country Central School District.
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