ZIP Code 51003
Alton · Sioux, Iowa
51003 is the ZIP code of Alton in Sioux, Iowa, United States.
- ZIP Code
- 51003
- County
- Sioux
- State
- Iowa
- Country
- United States
Place with ZIP code 51003
| Place | County | Location |
|---|---|---|
| Alton | Sioux | 42.978, -96.017 |
Nearby ZIP codes
Frequently asked questions
Which places use ZIP code 51003?
Alton.
Which county and state is 51003 in?
Sioux, Iowa, United States.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.