Islip, New York Zip Codes
📍 Islip is in Suffolk County, New York with 1 zip code; the most populous is 11751.
Islip is a USPS city name in Suffolk County, New York with a Census population of approximately 13,152 across its ZIP codes. Suffolk County as a whole has 117 ZIP codes in this directory. Below you'll find every zip code serving Islip with population, income and home value, a map, and the city's affordability profile.
Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).
All Islip Zip Codes
Islip at a Glance
Islip has 1 ZIP code in this directory: 1 standard delivery ZIP. Its one ZIP with published Census housing data, 11751, has 13,152 residents.
Islip's ZIP has a household income of $116,328 and a home value of $501,900, a price-to-income ratio of 4.3, above the 2.9 New York ZIP median. Median rent across these ZIPs is $2,238 a month.
83% of households in Islip own their home (statewide ZIP median 80%). 36% of adults hold a bachelor's degree, above the 31% statewide median. The median poverty rate is 5.6%, below the 9.9% statewide ZIP median. Overall density is about 3,288 residents per square mile across 4 square miles of ZIP land area.
Medians are taken across the ZIP codes listed below (each ZIP weighted equally); PO Box and no-data ZIPs are excluded. Definitions on the methodology page; statewide comparisons in the 2026 New York ZIP Code Affordability Report.
Islip Zip Code Map
Interactive map of Islip, New York zip codes. Click any marker for details.