Onawa, IA zip code
Onawa, Iowa uses one zip code: 51040. Most of it is in Monona County. Together these zip codes are home to about 3.5K people.
Zip codes
1
Population
3.5K
All zips combined
Largest zip
51040
3,500 residents
Zip codes in Onawa
| Zip | Type | Population | IncomeMedian income |
|---|---|---|---|
| 51040 | 3,500 | $71,179 |