Since 1988, Ronkonkoma has 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 also home to the Town of Islip owned and operated Long Island MacArthur Airport (sometimes referred to only as Islip), airport code ISP.

The New York Air Route Traffic Control Center is located in Ronkonkoma, as is 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.

 

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