Smithtown, New York Zip Codes
📍 Smithtown is in Suffolk County, New York with 2 zip codes; the most populous is 11787.
Smithtown is a USPS city name in Suffolk County, New York with a Census population of approximately 34,656 across its ZIP codes. Suffolk County as a whole has 117 ZIP codes in this directory. Below you'll find every zip code serving Smithtown 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 Smithtown Zip Codes
Smithtown at a Glance
Smithtown has 2 ZIP codes in this directory: 2 standard delivery ZIPs. Its one ZIP with published Census housing data, 11787, has 34,656 residents.
Smithtown's ZIP has a household income of $141,505 and a home value of $642,200, a price-to-income ratio of 4.5, far above the 2.9 New York ZIP median. Median rent across these ZIPs is $2,349 a month.
86% of households in Smithtown own their home (statewide ZIP median 80%). 51% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 5.3%, below the 9.9% statewide ZIP median. Overall density is about 2,326 residents per square mile across 15 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.
Smithtown Zip Code Map
Interactive map of Smithtown, New York zip codes. Click any marker for details.