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is a census-designated place (CDP) in Suffolk County, New York, United States. The population was 20,029 at the 2000 census.
Ronkonkoma has, since 1988, been the end of electrification along the Long Island Rail Road's Main Line, leading most service along the line to be referred to as Ronkonkoma Branch service.
Ronkonkoma is home to Town of Islip owned and operated Long Island MacArthur Airport (sometimes referred to only as Islip). Airport code ISP.
Ronkonkoma is located at (40.813962, -73.128438). According to the United States Census Bureau, the CDP has a total area of 8.5 square miles (22.1 km²).21.2 km² (8.2 mi²) of it is land and
The community is adjacent to Lake Ronkonkoma. CVD Equipment Corporation, a nanotechnology
and high-technology engineering company that is doing research on carbon nanotubes in cooperation with the University of Cincinnati in Ohio, is located in town.