Ronkonkoma is a census-designated place on Long Island in the Town of Islip, Suffolk County, New York, United States. The population was 20,029 at the 2000 census. The Ronkonkoma post office has the ZIP code of 11779, and serves parts of several hamlets and CDPs adjacent to Ronkonkoma also. Since 1988, Ronkonkoma has been the end of electrification along the Long Island Rail Road's Main Line. The track between Hicksville and Ronkonkama has long been referred to as the Ronkonkoma Branch. Ronkonkoma is also home to Long Island MacArthur Airport , airport code ISP, which is owned and operated... by the Town of Islip. 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. Ronkonkoma is located at 40°48′50″N 73°7′42″W / 40.81389°N 73.12833°W / 40.81389; -73.12833 . According to the United States Census Bureau, the CDP has a total area of 8.5 square miles , 21.
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| County: | Suffolk County |
| State: | New York |
| Population: | 20,029 |
| Area: | 8.5 sq. mi. |
| Time zone: | North American Eastern Time Zone |
| Also known as: | Ronkonkoma, New York |