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City ZIP codes · New Jersey

Princeton, NJ ZIP Codes

5 ZIP codes use the postal name Princeton, New Jersey (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 3 residential and 2 for PO boxes or a single organization. Median household income runs from $105,524 in 08542 to $176,983 in 08540, 1.7 times as much (Census Bureau, ACS 2020-2024). Princeton's most populous ZIP code is 08540, with 50,388 people (ACS 2020-2024); 34% of its land is in the city of Princeton.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Princeton's ZIP codes?

08540: $177k median household income08542: $106k median household income08544: – median household income085400854208540: $177k median household income08542: $106k median household income08544: – median household income085400854208540: $177k median household income08542: $106k median household income08544: – median household income08540
The 3 residential ZIP codes named Princeton, shaded by median household income in national fifths (ACS 2020-2024). Select a ZIP to open it. <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are Princeton's ZIP codes?

The highest median household income is in 08540 ($176,983), the lowest in 08542 ($105,524). Home values run from $754,100 in 08542 to $767,900 in 08540.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013, B25077, B01003).

All 3 residential ZIP codes of Princeton

Residential ZIP codes with the postal name Princeton, NJ, largest first (ACS 2020-2024); sort by any column
County
08540 Mercer County 50,388 974 $177k $768k
08544 Mercer County 4,392 26,458 – –
08542 Mercer County 2,533 6,562 $106k $754k

Download the 5 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; 2023 Gazetteer land areas (2020 ZCTAs); town names from simplemaps US ZIP Codes (CC BY 4.0) and GeoNames (CC BY 4.0).

PO Box and single-organization ZIP codes in Princeton

2 ZIP codes named Princeton have no residential delivery area: post office boxes, or one organization (a large employer, an agency, a university) with its own code. The Census Bureau publishes no figures for them.

Princeton, NJ: ZIP codes without a residential area, for PO boxes or one organization (GeoNames postal codes; USPS does not publish openly which is which)
ZIPCounty
08541Mercer County
08543Mercer County

Source: GeoNames postal codes (CC BY 4.0); a ZIP code with no Census ZCTA has no residential delivery area.

Which counties do Princeton's ZIP codes reach?

Princeton's residential ZIP codes lie in 3 counties: Mercer County (3 ZIP codes mainly there), Somerset County (part of a ZIP code), Middlesex County (part of a ZIP code).

Which places do Princeton's ZIP codes cover?

A postal name is not a city limit. By the Census Bureau's places, Princeton's residential ZIP codes cover Princeton itself and 4 other places, each listed with the ZIP codes that have at least 5% of their land in it or hold most of the place:

  • East Rocky Hill census-designated 08540
  • Griggstown census-designated 08540
  • Princeton Junction census-designated 08540
  • Ten Mile Run census-designated 08540

Source: U.S. Census Bureau, 2020 ZCTA-to-place relationship file (shares of land).

Which first three digits do Princeton's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Princeton starts with 085.

Three-digit prefixes of Princeton's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Princeton's
PrefixSectional centerHereAll codes
085 Trenton, NJ (SCF 085) 5 37

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.