Syosset, New York Zip Codes
📍 Syosset is in Nassau County, New York with 2 zip codes; the most populous is 11791.
Syosset is a USPS city name in Nassau County, New York with a Census population of approximately 25,194 across its ZIP codes. Nassau County as a whole has 110 ZIP codes in this directory. Below you'll find every zip code serving Syosset 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 Syosset Zip Codes
Syosset at a Glance
Syosset has 2 ZIP codes in this directory: 2 standard delivery ZIPs. Its one ZIP with published Census housing data, 11791, has 25,194 residents.
Syosset's ZIP has a household income of $204,357 and a home value of $918,900, a price-to-income ratio of 4.5, far above the 2.9 New York ZIP median. Median rent across these ZIPs is $3,091 a month.
93% of households in Syosset own their home (statewide ZIP median 80%). 71% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 3.5%, far below the 9.9% statewide ZIP median. Overall density is about 2,016 residents per square mile across 13 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.
Syosset Zip Code Map
Interactive map of Syosset, New York zip codes. Click any marker for details.