Lake Ronkonkoma, New York

Lake Ronkonkoma, New York
Lake Ronkonkoma – the lake for which the community was named
U.S. Census map
Lake Ronkonkoma
Location on Long Island
Lake Ronkonkoma
Location within the state of New York
Coordinates: 40°49′47″N 73°6′47″W / 40.82972°N 73.11306°W / 40.82972; -73.11306
Country United States
State New York
CountySuffolk
TownsBrookhaven
Smithtown
Named afterLake Ronkonkoma
Area
 • Total
4.54 sq mi (11.76 km2)
 • Land4.54 sq mi (11.75 km2)
 • Water0.0039 sq mi (0.01 km2)
Elevation
72 ft (22 m)
Population
 (2020)
 • Total
18,619
 • Density4,104.3/sq mi (1,584.67/km2)
Time zoneUTC–5 (Eastern (EST))
 • Summer (DST)UTC–4 (EDT)
ZIP Code
11779
Area codes631, 934
FIPS code36-40838
GNIS feature ID0954936

Lake Ronkonkoma is a hamlet and census-designated place (CDP) in Suffolk County, on Long Island, in New York, United States. The population was 18,619 at the time of the 2020 census.

Located on the north and east sides of the eponymous lake, Lake Ronkonkoma is mainly located within the Town of Brookhaven, with the northwestern section being located within the Town of Smithtown.