ZIP Code 11787

11787 is one of New York's ZIP codes, delivering to addresses in Smithtown, Suffolk County.

City: Smithtown
County: Suffolk County
State: New York
Prefix: 117xx

Where this code sits

11787 is part of the 117xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Smithtown.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 11787 delivers to without sharing its boundary.

ZIP codes nearest 11787

The ZIP codes whose reference points sit closest to 11787.
ZIP code	Distance	Delivers to
ZIP code 11788	2.3 mi	Hauppauge, NY
ZIP code 11754	2.7 mi	Kings Park, NY
ZIP code 11780	3.4 mi	Saint James, NY
ZIP code 11767	3.5 mi	Nesconset, NY
ZIP code 11725	3.5 mi	Commack, NY
ZIP code 11749	4.0 mi	Islandia, NY
ZIP code 11722	4.8 mi	Central Islip, NY
ZIP code 11755	5.1 mi	Lake Grove, NY

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 11787, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 11787. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.