ZIP Code 51003
Alton, Iowa
ZIP Code Information
ZIP code 51003 identifies a postal delivery area inside Alton, Iowa. The ZIP lies within Sioux County. Clocks here follow the America/Chicago time zone (UTC-5).
About 1,746 people live in this ZIP code, and the median household income is roughly $67,986 a year. Figures come from the U.S. Census Bureau American Community Survey and are refreshed as new five-year estimates are released.
What you can do with ZIP code 51003
- Write a mailing address: Alton, IA 51003. The ZIP goes last, after the state abbreviation.
- Check whether a shipping or delivery quote applies to this area — most US carriers price by ZIP code rather than by city.
- Look up the local time zone before scheduling a call — the ZIP tells you which zone applies to that address.
- Compare the ZIP with neighbouring codes to see how population and income shift block by block.
Location Map
Full mapNearby ZIP Codes
Radius search| ZIP Code | City | Distance | |
|---|---|---|---|
| 51041 | Orange City | 5.5 km | Distance |
| 51022 | Granville | 9.8 km | Distance |
| 51036 | Maurice | 12.2 km | Distance |
| 51238 | Hospers | 14 km | Distance |
| 51250 | Sioux Center | 17.5 km | Distance |
| 51045 | Oyens | 17.9 km | Distance |
| 51050 | Remsen | 18.9 km | Distance |
| 51031 | Le Mars | 23.8 km | Distance |
| 51035 | Marcus | 24.8 km | Distance |
| 51027 | Ireton | 24.9 km | Distance |
Nearby Cities
Orange City, Iowa
(5.5 km)
Granville, Iowa
(9.8 km)
Maurice, Iowa
(12.2 km)
Hospers, Iowa
(14 km)
Sioux Center, Iowa
(17.5 km)
Oyens, Iowa
(17.9 km)
Remsen, Iowa
(18.9 km)
Le Mars, Iowa
(23.8 km)
Frequently Asked Questions
ZIP code 51003 is located in Alton, Iowa.
ZIP code 51003 is in Sioux county, Iowa.
ZIP code 51003 is in the America/Chicago timezone.