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Lake Ronkonkoma, New York

Lake Ronkonkoma, New York
census-designated place
The lake that the community was named for
The lake that the community was named for
U.S. Census map
U.S. Census map
Lake Ronkonkoma is located in New York
Lake Ronkonkoma
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; -73.11306Coordinates: 40°49′47″N 73°6′47″W / 40.82972°N 73.11306°W / 40.82972; -73.11306
Country United States
State New York
County Suffolk
Area
 • Total 4.9 sq mi (12.7 km2)
 • Land 4.9 sq mi (12.7 km2)
 • Water 0.0 sq mi (0.0 km2)
Elevation 72 ft (22 m)
Population (2010)
 • Total 20,155
 • Density 4,100/sq mi (1,600/km2)
Time zone Eastern (EST) (UTC-5)
 • Summer (DST) EDT (UTC-4)
ZIP code 11779
Area code(s) 631
FIPS code 36-40838
GNIS feature ID 0954936
Lake Ronkonkoma
Location Suffolk County, New York
Coordinates 40°49′42″N 073°07′18″W / 40.82833°N 73.12167°W / 40.82833; -73.12167 (Lake Ronkonkoma (lake))
Primary inflows groundwater
Primary outflows underground
Basin countries United States
Max. depth 66 ft (20 m)
Surface elevation 52 ft (16 m)

Lake Ronkonkoma is a census-designated place (CDP) in Suffolk County, New York, United States. The population was 20,155 at the 2010 census.

Lake Ronkonkoma is mainly located in the Town of Brookhaven, but has small sections in the Town of Smithtown and the 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).

According to the United States Census Bureau, the CDP has a total area of 4.9 square miles (13 km2), all land.

The actual lake, Lake Ronkonkoma, adjacent to the CDP, is the largest lake on Long Island. The land surrounding the lake itself is in the jurisdiction of Islip. The elevation of the lake surface is given as 55 feet (17 m) on the most recent USGS map, but as the lake is a "groundwater lake", not fed by streams, it has no surface outlet and its water surface reflects the current level of the local water table. This can undergo significant changes over time, and the lake level experiences slow periods of rise and fall. In the late 1960s it was quite low; after several intermediate changes in level, in 2007 the lake was higher than at any time since, with a difference of well over 5 feet (1.5 m) between the 1960s low and the 2007 high.

As a result of the lake's existence, Lake Ronkonkoma was once a resort town, until the area experienced a population explosion in the mid-20th century. Remnants of old resorts and hotels can still be seen around the lake's shores. Many summer cottages and bungalows from that period remain, now converted to year-round use.


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