City · Iowa · United States
Onawa, IA — ZIP codes
1 ZIP code · Monona County
- City
- Onawa
- County
- Monona
- State
- Iowa
- Country
- United States
- Postal code
- 51040Single source
- Coordinates
- 42.0370, -96.1072 View on OpenStreetMap
ZIP codes (1)
| Postal code | Place name | Verification |
|---|---|---|
| 51040 | Onawa | Single source |
Sources and verification
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames. Last generated : 2026-08-21. Report an error.