Town of Islip, Suffolk County, New York
The Town of Islip is a town in Suffolk County, New York. About 339,106 people live there (2020–2024 estimate). It covers 103 sq mi (267 km²) of land and uses Eastern Time. It has its own local government.
- Population, 2020–2024 estimate
- 339,106 ± 46
- County
- Suffolk County
- Land area
- 103 sq mi (267 km²)
- Type
- TownIts own local government
- Time zone
- Eastern TimeUTC-05:00 in January; UTC-04:00 in July
- Median household income
- $130,132 ± $2,573
- Median home value
- $535,300 ± $6,786
- Water area
- 59.6 sq mi (154 km²)
- State
- New York
- Census code (GEOID)
- 3610338000
- Coordinates (central point)
- 40.714958, -73.195152
These coordinates mark a central point for the area, not a street address. Population, income and home value: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 20, 2026.
Cities, towns and communities in the Town of Islip, largest first
- Central Islip (CDP)38,373 people
- Bay Shore (CDP)31,683 people
- West Islip (CDP)26,865 people
- Holbrook (CDP)26,449 people
- Hauppauge (CDP)20,793 people
- North Bay Shore (CDP)20,282 people
- Holtsville (CDP)19,344 people
- Ronkonkoma (CDP)18,709 people
- Islip (CDP)17,362 people
- Sayville (CDP)15,408 people
- East Islip (CDP)13,573 people
- Bohemia (CDP)9,181 people
All 27
- Bayport (CDP)8,921 people
- Baywood (CDP)8,176 people
- Oakdale (CDP)7,115 people
- Islip Terrace (CDP)5,168 people
- West Sayville (CDP)4,800 people
- West Bay Shore (CDP)4,208 people
- North Great River (CDP)3,909 people
- Islandia (village)3,600 people
- Brightwaters (village)3,179 people
- Great River (CDP)1,899 people
- Fire Island (CDP)352 people
- Captree (CDP)282 people
- Ocean Beach (village)24 people
- Saltaire (village)8 people
- Brentwood (CDP)
These places’ central points lie inside the Town of Islip. A place can reach across the line, and its government, if it has one, can be separate from the town’s.
Bordering areas, nearest first
- Town of Babylon8.2 mi southwest
- Town of Smithtown14 mi north
- Town of Huntington15 mi northwest
- Town of Brookhaven16 mi northeast
These towns, townships, cities and boroughs share a boundary with the Town of Islip. Distances are straight lines between central points, not driving distances.
Other towns in Suffolk County, largest first
- Town of Brookhaven489,810 people
- Town of Babylon218,262 people
- Town of Huntington204,059 people
- Town of Smithtown116,097 people
- Town of Southampton69,679 people
- Town of Riverhead35,980 people
- Town of East Hampton28,701 people
- Town of Southold23,905 people
- Town of Shelter Island3,355 people
People counts are American Community Survey 2020–2024 5-year estimates. See Suffolk County for its cities, ZIP Code areas and county seat.
Sunrise and sunset in the Town of Islip
- Longest day
- 15 hours 6 minutes around June 21
- Shortest day
- 9 hours 15 minutes around December 21
- Earliest sunrise
- 5:21 AM around June 14
- Latest sunrise
- 7:28 AM the day before clocks go back in November
- Earliest sunset
- 4:25 PM around December 8
- Latest sunset
- 8:28 PM around June 27
Clocks go forward an hour on the second Sunday in March and back on the first Sunday in November, so sunrise and sunset jump an hour later in March and an hour earlier in November.
| Day | Sunrise | Sunset | Daylight |
|---|---|---|---|
| Jan 15 | 7:14 AM | 4:49 PM | 9 h 35 min |
| Feb 15 | 6:46 AM | 5:27 PM | 10 h 41 min |
| Mar 15 | 7:04 AM | 6:59 PM | 11 h 55 min |
| Apr 15 | 6:14 AM | 7:32 PM | 13 h 18 min |
| May 15 | 5:35 AM | 8:02 PM | 14 h 27 min |
| Jun 15 | 5:21 AM | 8:25 PM | 15 h 4 min |
| Jul 15 | 5:34 AM | 8:22 PM | 14 h 48 min |
| Aug 15 | 6:02 AM | 7:50 PM | 13 h 48 min |
| Sep 15 | 6:33 AM | 7:02 PM | 12 h 29 min |
| Oct 15 | 7:03 AM | 6:12 PM | 11 h 9 min |
| Nov 15 | 6:39 AM | 4:34 PM | 9 h 55 min |
| Dec 15 | 7:09 AM | 4:26 PM | 9 h 17 min |
Approximate times for a flat horizon at the central point; the days move by a day or so from year to year. Hills and weather can change what you see.
Before using this answer on a form
A town line is not always the line on your mail: a mailing address can name another town or post office, and school districts, ZIP Codes and tax districts follow their own lines. For taxes, voting or permits, check the full address with Suffolk County or the local office.
Find the township or town where you are now or find your county.