Home > NY > Suffolk County > Smithtown > Zip 11787

Zip Code 11787 — Smithtown, NY

11787 is a ZIP Code associated with Smithtown, NY, located within Suffolk. The postal region supports an estimated population of 34,499 residents across Data Pending housing units, with a population density of 894.0 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (40.853380, -73.210890)

Data MetricLocal Statistic
Postal / Zip Code11787
Primary CitySmithtown
State / ProvinceNY
CountySuffolk
Total Population34,499
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density894.0 people/sq mi
TimezoneAmerica/New_York

How 11787 Compares

MetricZIP 11787Suffolk CountyNY State Average
Population34,4991,476,04419,771,902
Median IncomeData PendingN/AN/A
Population Density894.0 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 11788Hauppauge2.4 mi17,374N/A
Zip 11754Kings Park3.0 mi17,565N/A
Zip 11780Saint James3.5 mi15,018N/A
Zip 11767Nesconset3.5 mi14,964N/A
Zip 11725Commack3.8 mi29,073N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →