Zip Code 08550 — Princeton Junction, NJ
08550 is a ZIP Code associated with Princeton Junction, NJ, located within Mercer. 08550 ranks #9 out of 22 ZIP codes in Mercer County by population (and #164 out of 598 in NJ). The area supports an estimated population of 21,067 residents across Data Pending housing units, with a population density of 425.1 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (40.281250, -74.619260)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 08550 |
| Primary City | Princeton Junction |
| State / Province | NJ |
| County | Mercer |
| Total Population | 21,067 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 425.1 people/sq mi |
| Timezone | America/New_York |
How 08550 Compares
| Metric | ZIP 08550 | Mercer County | NJ State Average |
|---|
| Population | 21,067 | 395,671 (Total) | 9,343,809 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 425.1 /sq mi | -- | -- |
| County Pop Rank | #9 of 22 | -- | -- |
Nearby ZIP Codes
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 →