ZIP code · Smithtown · New York · United States
ZIP code 11787 — Smithtown
ZIP code 11787 serves Smithtown, New York.
- Postal code
- 11787Single source Value from one source, not cross-checked.
- City
- Smithtown
- County
- Suffolk
- State
- New York
- Country
- United States
- Coordinates
- 40.8542, -73.2138 — precision precise (locality)
View on OpenStreetMap - Population
- 34,656 (ZCTA, ACS 5-year)
- Median household income
- $141,505
- Median age
- 46.9
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
- Area codes
- 631, 934Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS). Data generated on 2026-08-21. Methodology · Report an error on this page