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Zip Code 08540 — Princeton, NJ

08540 is a ZIP Code associated with Princeton, NJ, located within Mercer. 08540 ranks #1 out of 22 ZIP codes in Mercer County by population (and #26 out of 598 in NJ). The area supports an estimated population of 50,388 residents across Data Pending housing units, with a population density of 376.2 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (40.364230, -74.656610)

Data MetricLocal Statistic
Postal / Zip Code08540
Primary CityPrinceton
State / ProvinceNJ
CountyMercer
Total Population50,388
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density376.2 people/sq mi
TimezoneAmerica/New_York

How 08540 Compares

MetricZIP 08540Mercer CountyNJ State Average
Population50,388395,671 (Total)9,343,809 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density376.2 /sq mi----
County Pop Rank#1 of 22----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 08542Princeton0.7 mi2,533N/A
Zip 08544Princeton1.2 mi4,392N/A
Zip 08553Rocky Hill2.6 mi819N/A
Zip 08528Kingston2.6 mi321N/A
Zip 08558Skillman4.2 mi7,648N/A

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 →