ZIP Codes in Princeton, NJ
Princeton uses 3 ZIP codes, all in Mercer County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 3 Princeton ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 08540 | standard | Mercer | 50,388 |
| 08542 | standard | Mercer | 2,533 |
| 08544 | standard | Mercer | 4,392 |
Finding a ZIP+4 in Princeton
Knowing which of these 3 ZIP codes covers an address only gets you partway. The four-digit extension identifies the specific delivery point — typically one side of one block. Two houses facing each other on the same Princeton street almost always have different ZIP+4 codes even though they share all five leading digits.
Appending ZIP+4 to a mailing list?
Upload a CSV of Princeton addresses and download it complete.