Zip Code 11787 — Smithtown, NY
11787 is a ZIP Code associated with Smithtown, NY, located within Suffolk. 11787 ranks #9 out of 108 ZIP codes in Suffolk County by population (and #181 out of 1,826 in NY). The area 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 Metric | Local Statistic |
|---|
| Postal / Zip Code | 11787 |
| Primary City | Smithtown |
| State / Province | NY |
| County | Suffolk |
| Total Population | 34,499 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 894.0 people/sq mi |
| Timezone | America/New_York |
How 11787 Compares
| Metric | ZIP 11787 | Suffolk County | NY State Average |
|---|
| Population | 34,499 | 1,476,044 (Total) | 19,771,902 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 894.0 /sq mi | -- | -- |
| County Pop Rank | #9 of 108 | -- | -- |
Nearby ZIP Codes
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 →