ZIP Codes in Cambridge, MA
Cambridge uses 5 ZIP codes, all in Middlesex County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 5 Cambridge ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 02138 | standard | Middlesex | 38,509 |
| 02139 | standard | Middlesex | 40,033 |
| 02140 | standard | Middlesex | 21,204 |
| 02141 | standard | Middlesex | 14,517 |
| 02142 | standard | Middlesex | 4,737 |
Finding a ZIP+4 in Cambridge
Knowing which of these 5 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 Cambridge 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 Cambridge addresses and download it complete.