Alton, IA zip code
Alton, Iowa uses one zip code: 51003. Most of it is in Sioux County. Together these zip codes are home to about 1.9K people.
Zip codes
1
Population
1.9K
All zips combined
Largest zip
51003
1,938 residents
Zip codes in Alton
| Zip | Type | Population | IncomeMedian income |
|---|---|---|---|
| 51003 | 1,938 | $101,250 |