ZIP Codes in Dorchester, MA
Dorchester uses 3 ZIP codes, all in Suffolk County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 3 Dorchester ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 02121 | standard | Suffolk | 29,040 |
| 02122 | standard | Suffolk | 23,479 |
| 02125 | standard | Suffolk | 33,662 |
Finding a ZIP+4 in Dorchester
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 Dorchester 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 Dorchester addresses and download it complete.