ZIP Codes in Caldwell, ID
Caldwell uses 2 ZIP codes, all in Canyon County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 2 Caldwell ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 83605 | standard | Canyon | 41,325 |
| 83607 | standard | Canyon | 35,491 |
Finding a ZIP+4 in Caldwell
Knowing which of these 2 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 Caldwell 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 Caldwell addresses and download it complete.