ZIP Codes in Little Sioux, IA
Little Sioux uses 1 ZIP code, all in Harrison County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 1 Little Sioux ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 51545 | standard | Harrison | 267 |
Finding a ZIP+4 in Little Sioux
Knowing which of these 1 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 Little Sioux 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 Little Sioux addresses and download it complete.