About This Place
Lake Ronkonkoma is a hamlet (and census-designated place) in Suffolk County, New York, United States. The population was 19,701 at the 2000 census.
Lake Ronkonkoma is located mainly in the town of Brookhaven, but has small sections in the Towns of Smithtown and Town of Islip. Sachem High School North is located in Lake Ronkonkoma.
Lake Ronkonkoma is located at 40°49′47″N 73°6′47″W / 40.82972°N 73.11306°W / 40.82972; -73.11306 (40.829709, -73.113015).