ZIP Codes in Hammond, IN
Hammond uses 4 ZIP codes, all in Lake County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 4 Hammond ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 46320 | standard | Lake | 14,353 |
| 46323 | standard | Lake | 23,047 |
| 46324 | standard | Lake | 21,409 |
| 46327 | standard | Lake | 10,597 |
Finding a ZIP+4 in Hammond
Knowing which of these 4 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 Hammond 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 Hammond addresses and download it complete.