Seaford, New York Zip Codes
📍 Seaford is in Nassau County, New York with 1 zip code; the most populous is 11783.
Seaford is a USPS city name in Nassau County, New York with a Census population of approximately 21,588 across its ZIP codes. Nassau County as a whole has 110 ZIP codes in this directory. Below you'll find every zip code serving Seaford 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 Seaford Zip Codes
Seaford at a Glance
Seaford has 1 ZIP code in this directory: 1 standard delivery ZIP. Its one ZIP with published Census housing data, 11783, has 21,588 residents.
Seaford's ZIP has a household income of $164,128 and a home value of $626,700, a price-to-income ratio of 3.8, above the 2.9 New York ZIP median. Median rent across these ZIPs is $2,806 a month.
93% of households in Seaford own their home (statewide ZIP median 80%). 46% of adults hold a bachelor's degree, above the 31% statewide median. The median poverty rate is 2.9%, far below the 9.9% statewide ZIP median. Overall density is about 6,168 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.
Seaford Zip Code Map
Interactive map of Seaford, New York zip codes. Click any marker for details.