ZIP Code 08540

08540 is one of New Jersey's ZIP codes, delivering to addresses in Princeton, Mercer County.

City: Princeton
County: Mercer County
State: New Jersey
Prefix: 085xx

Where this code sits

08540 is part of the 085xx range, the group of codes handled by one mail processing centre. Princeton is served by 5 ZIP codes in total; the full list, with the county each falls in, is on the Princeton page.

Princeton New Jersey ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 08540 delivers to without sharing its boundary.

ZIP codes nearest 08540

The ZIP codes whose reference points sit closest to 08540.
ZIP code	Distance	Delivers to
ZIP code 08542	1.3 mi	Princeton, NJ
ZIP code 08544	1.4 mi	Princeton, NJ
ZIP code 08541	1.6 mi	Princeton, NJ
ZIP code 08528	2.0 mi	Kingston, NJ
ZIP code 08553	2.4 mi	Rocky Hill, NJ
ZIP code 08504	4.3 mi	Blawenburg, NJ
ZIP code 08536	4.5 mi	Plainsboro, NJ
ZIP code 08558	4.5 mi	Skillman, NJ

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 08540, plotted from its record coordinates.

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

Scope ZIP code 08540. 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.