Ronkonkoma is a hamlet and census-designated place (CDP) on Long Island in the Town of Islip, Suffolk County, New York, United States. The population of the CDP was 19,082 at the 2010 census. The Ronkonkoma post office has the ZIP code of 11779, and serves parts of several hamlets and CDPs adjacent to Ronkonkoma.
Ronkonkoma is also home to Long Island MacArthur Airport (sometimes referred to simply as Islip 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.