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Islip, New York
Town of Islip
Islip Town Hall in 2012.
Islip Town Hall in 2012.
Flag of Islip, New York
Fide sed cui vide
U.S. Census map of the Town of Islip.
U.S. Census map of the Town of Islip.
Islip, New York is located in New York
Islip, New York
Islip, New York
Location in New York
Islip, New York is located in the United States
Islip, New York
Islip, New York
Location in the United States
Country  United States
State  New York
County Suffolk
Named for Islip, Northamptonshire
 • Type Civil Township
 • Total 162.98 sq mi (422.10 km2)
 • Land 103.80 sq mi (268.84 km2)
 • Water 59.17 sq mi (153.26 km2)
7 ft (2 m)
 • Total 339,938
 • Density 3,275.9/sq mi (1,264.5/km2)
Time zone UTC-5 (Eastern (EST))
 • Summer (DST) UTC-4 (EDT)
ZIP code
11705, 11706, 11716, 11717, 11718, 11722, 11730, 11739, 11749, 11751, 11752, 11760, 11769, 11770, 11782, 11795, 11796, 11702 (part), 11729 (part), 11742 (part), 11741 (part)
Area code(s) 631, 934
FIPS code 36-38000
GNIS feature ID 0979097

Islip ( EYE-slip) is one of ten towns in Suffolk County, New York, United States. Located on the south shore of Long Island, the town population was 335,543 at the 2010 census, it is the fourth most populous City or Town in the state.

The Town of Islip also contains a smaller, unincorporated hamlet and census-designated place named Islip.


Historical population
Census Pop.
1790 609
1800 958 57.3%
1810 885 −7.6%
1820 1,156 30.6%
1830 1,653 43.0%
1840 1,909 15.5%
1850 2,602 36.3%
1860 3,845 47.8%
1870 4,597 19.6%
1880 6,453 40.4%
1890 8,783 36.1%
1900 12,545 42.8%
1910 18,346 46.2%
1920 20,709 12.9%
1930 33,194 60.3%
1940 51,182 54.2%
1950 71,465 39.6%
1960 172,959 142.0%
1970 278,880 61.2%
1980 298,897 7.2%
1990 299,587 0.2%
2000 322,612 7.7%
2010 335,543 4.0%
2020 339,938 1.3%
U.S. Decennial Census

At the 2000 census, there were 322,612 people, 98,936 households and 78,555 families residing in the town. The population density was 3,064.5 per square mile (1,183.1/km2). There were 104,278 housing units at an average density of 990.5 per square mile (382.4/km2). The racial makeup of the town was 77.25% White, 9.02% Black or African American, 0.26% Native American, 2.17% Asian, 0.05% Pacific Islander, 8.32% from other races, and 2.93% from two or more races. Hispanic or Latino of any race were 20.16% of the population.

There were 98,936 households, of which 39.4% had children under the age of 18 living with them, 62.4% were married couples living together, 12.3% had a female householder with no husband present, and 20.6% were non-families. 16.2% of all households were made up of individuals, and 6.4% had someone living alone who was 65 years of age or older. The average household size was 3.22 and the average family size was 3.55.

27.4% of the population were under the age of 18, 8.1% from 18 to 24, 32.4% from 25 to 44, 22.2% from 45 to 64, and 9.9% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 96.7 males. For every 100 females age 18 and over, there were 93.1 males.

According to a 2006 estimate, the median household income was $78,991, and the median family income was $86,190. Males had a median income of $49,069 versus $33,660 for females. The per capita income for the town was $29,699. About 4.1% of families and 6.2% of the population were below the poverty line, including 7.9% of those under age 18 and 7.0% of those age 65 or over.

Geography and climate


According to the United States Census Bureau, the town has a total area of 163.1 square miles (422.5 km²), of which, 105.3 square miles (272.7 km²) is land and 57.8 square miles (149.8 km²) (35.46%) is water.

The Town of Islip has the following boundaries: to the west, the Town of Babylon (at approximately route 231); to the east, the Town of Brookhaven (at approximately Nicoll's Road); to the north, the Town of Smithtown (at approximately the Long Island Expressway); and to the south, the Atlantic Ocean. The town includes part of Fire Island and the Great South Bay.


Under the Köppen climate classification, Islip straddles the humid subtropical (Cfa) and a humid continental (Dfa), with some maritime influence; it is part of USDA hardiness zone 7a. The normal average monthly temperature ranges from 30.6 °F (−0.8 °C) in January to 73.9 °F (23.3 °C) in July; on average, there are 18 days where the temperature remains at or below freezing and 7.5 days with a high at or above 90 °F (32 °C) annually; the last year to not reach the latter mark was 2014. Temperatures reaching 0 °F (−18 °C) or 100 °F (38 °C) are rare, and were last seen respectively on February 14, 2016 and July 22, 2011. The record low is −7 °F (−22 °C), set on January 22, 1984 and January 15, 1988, while the record high is 102 °F (39 °C), set on July 5, 1999.

Precipitation averages 46.2 inches (1,170 mm) annually, and is somewhat evenly distributed throughout the year, though March and April are the wettest months in terms of total precipitation. Snowfall averages 24.8 inches (63 cm) per winter, falling almost entirely from December to March. As is typical of Long Island, snow cover does not usually remain for long, with an average of 20–21 days per winter with snow cover of at least 1 inch (2.5 cm).

On August 12–13, 2014, a new 24-hour precipitation record for the state of New York was set at 13.57 in (345 mm), including 1.08 in (27 mm) in 9 minutes during the morning of August 12. This caused flooding on the Southern State Parkway, Sunrise Highway and other area thoroughfares.

Climate data for Islip, New York (Long Island MacArthur Airport), 1981–2010 normals, extremes 1984–present
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 69
Average high °F (°C) 38.0
Average low °F (°C) 23.3
Record low °F (°C) −7
Average precipitation inches (mm) 3.64
Average snowfall inches (cm) 6.7
Average precipitation days (≥ 0.01 in) 11.0 9.1 10.5 11.3 11.1 10.1 9.1 8.5 8.6 8.5 10.3 10.8 118.9
Average snowy days (≥ 0.1 in) 3.7 3.4 2.3 0.3 0 0 0 0 0 0 0.2 2.4 12.3
Source: NOAA


Matthias Nicoll relocated to New York from Islip, Northamptonshire, England, in 1664. His son, William Nicoll, became a royal patentee of the east end of what is now the Town of Islip, and his domain reached from East Islip to Bayport and included Sayville, West Sayville, Oakdale, Great River, Islip Terrace, Central Islip, Hauppauge, Holbrook, Bohemia, Brentwood, Holtsville and a portion of Ronkonkoma. All of this land was bought from Winne-quaheagh, Sachem (chief) of Connetquot in 1683. The yearly fee paid to Governor Thomas Dongan of New York was five bushels of quality winter wheat or 25 shillings. Other early land patentees were Andrew Gibb (Islip Hamlet), John Mowbray (Bay Shore, originally Awixa), Stephan Van Cortlandt (Sagtikos Manor), and Thomas Willets (West Islip).

By 1710, the colonial government passed an act to enable the precinct of Islip in the County of Suffolk to elect two assessors, a collector, a constable and a supervisor. The people had a voice. Growth, however, remained at a standstill until the Revolutionary War ended when, in the 17 years that followed, there was more progress than in the 50 years preceding. This activity was partly due to the impact of American shipping.

By 1825, it was necessary to install a Fire Island light across the Great South Bay and regular ferry service between Bay Shore and Fire Island began in 1862. In 1867[?] the Long Island Rail Road came to Islip and the first depot was built. People were discovering Islip and the tourist trade soon took hold.

Tourism brought much wealth into the area and business spung up to service the hotels that began to dot the landscape. Some of those tourists stayed on and built summer homes, thus the vacationers and the town seemed to enjoy a mutual prosperity. But the old guard was changing. Early in the 20th century, diesel-powered ferries replaced the whale boats while housing developments and small manufacturing firms sprang up on the sites of old farms. Like the rest of the country, Islip and all of Long Island suffered during the Stock Market Crash and the Great Depression. When the veterans returned home from World War II, there was a housing shortage in New York City, but a rebirth on Long Island. Within a decade following the end of the war, Islip began to turn from a bucolic farming community into a bustling suburb, becoming what was once described as a "bedroom" of New York City. The influx of people was tremendous - from 71,000 in 1950 to 280,000 in 1970. Then, as growth continued eastward on Long Island, the pace in Islip slowed.

Villages (incorporated)

Hamlets (unincorporated)

Other communities

  • Atlantique ✝
  • Captree Islands
  • Corneille Estates ✝
  • Dunewood
  • East Fire Island (Middle Island)
  • Edgewood (Brentwood ZIP code)
  • Fair Harbor
  • Lakeland (Ronkonkoma ZIP code)
  • Robbins Rest ✝
  • Seaview ✝
  • Sexton Island
  • West Fire Island (Thompson's Island)

State parks



ISP 310710 (6721917079) (2)
Long Island MacArthur Airport from the air in 2010.

Long Island MacArthur Airport and the New York Air Route Traffic Control Center, located in the Town of Islip, are both in the hamlet of Ronkonkoma. A smaller rural airport known as Bayport Aerodrome also exists within the town used for antique aircraft.

Railroad lines

The Long Island Rail Road's Montauk Branch is one of two lines running through the town spanning between the Village of Babylon and the Hamlet of Blue Point in the Town of Brookhaven, with stations from Bay Shore through Sayville. The other line is the Main Line which runs through the northern part of the town with stations in Brentwood, Central Islip and Ronkonkoma, which not only serves as a major transportation hub, but is also located on the Islip-Brookhaven Town Line.

Bus service

The Town of Islip is served entirely by Suffolk County Transit bus routes.

Major roads

  • I-495.svg Interstate 495 is the Long Island Expressway, and the sole interstate highway in the Town of Islip. It runs along the northern portion of the town between Exit 53 in Brentwood and east of Exit 59 in Ronkonkoma.
  • Southern Pkwy Shield.svg Southern State Parkway enters the Town of Islip from the Town of Babylon, and has interchanges at Robert Moses Causeway (Exit 40), Suffolk CR 57 (Exit 41 W-E), and Sagtikos State Parkway (Exit 41A). Trucks are forbidden from using the parkway, as with most parkways on Long Island.
  • Heckscher Pkwy Shield.svg Heckscher State Parkway is a continuation of Southern State Parkway leading west to east then curving south to Heckscher State Park in Great River.
  • Sagtikos Pkwy Shield.svg Sagtikos State Parkway is the main south-to-north parkway leading from Southern State and Heckscher Parkways in West Islip through the Long Island Expressway where it crosses the Islip-Smithtown Town Line.
  • Robert Moses Cswy Shield.svg Robert Moses Causeway is a south-to-north parkway leading from Robert Moses State Park to Southern State Parkway.
  • Ocean Pkwy Shield.svg Ocean Parkway runs across Jones Beach Island and terminates at Captree State Park.
  • NY-27.svg New York State Route 27 is Sunrise Highway, the other limited-access highway in the town that does not forbid trucks.
  • NY-27A.svg New York State Route 27A is Montauk Highway west of Connetquot River State Park.
  • Suffolk County 67.svg County Route 67, the remaining drivable portion of the Long Island Motor Parkway
  • Suffolk County 85.svg County Route 85 is Montauk Highway east of Connetquot River State Park.
  • Suffolk County 93.svg County Route 93 (Suffolk County, New York) is a four-lane south-north highway running from the northwestern edge of Sayville to the south and west side of Lake Ronkonkoma.
  • Suffolk County 97.svg County Route 97 is a partially limited-access highway in southeastern Islip Township.
  • NY-111.svg New York State Route 111 is the south-to-north state route that runs from the Hamlet of Islip through Hauppauge into the Town of Smithtown.
  • NY-231.svg New York State Route 231 runs along the Babylon-Islip town line as the unfinished Babylon-Northport Expressway before curving to the northwest and entering the Town of Babylon entirely.
  • NY-454.svg New York State Route 454 is a west-east divided highway known as the Veterans' Memorial Highway, which runs northwest to southeast from Commack to NY 27 west of Suffolk CR 97 in Holbrook. Within the town it runs from NY 347 at the Islip-Smithtown Town Line and serves as the address for Long Island MacArthur Airport.


Passenger ferries depart to Fire Island from Bay Shore and Sayville, which lead to communities both in the Towns of Islip and Brookhaven. Bay Shore has terminals for Fire Island ferries, serving Atlantique, Dunewood, Fair Harbor, Kismet, Ocean Bay Park, Ocean Beach, Saltaire, and Seaview, and smaller hamlets. They are located at the southernmost end of Maple Avenue. Some daily ferries to Atlantique also make a stop at the Bay Shore Marina, which is across the canal from the Maple Avenue ferries.

Sayville's ferry terminals lead to the communities of Cherry Grove and Fire Island Pines, both popular vacation communities for LGBT New Yorkers, as well as to Sailors Haven, which is located within the Sunken Forest Visitor's Center.


CA Technologies is based in Islandia. NBTY is based in Ronkonkoma. Sigma Corporation is based in Ronkonkoma.

See also

Kids robot.svg In Spanish: Islip (Nueva York) para niños

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