ZIP Codes in Casper, WY
Casper uses 3 ZIP codes, all in Natrona County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 3 Casper ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 82601 | standard | Natrona | 26,721 |
| 82604 | standard | Natrona | 27,487 |
| 82609 | standard | Natrona | 18,714 |
Finding a ZIP+4 in Casper
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 Casper 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 Casper addresses and download it complete.