ZIP Codes in Waltham, MA
Waltham uses 3 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 3 Waltham ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 02451 | standard | Middlesex | 17,393 |
| 02452 | standard | Middlesex | 15,808 |
| 02453 | standard | Middlesex | 31,591 |
Finding a ZIP+4 in Waltham
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 Waltham 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 Waltham addresses and download it complete.