15 ZIP Code Tabulation Areas in Monona County, Iowa. The population-weighted median household income is about $71,675, the median home value about $147,508, and 77.2% of occupied homes are owner-occupied.
- 15
- ZIP codes
- 13.8K
- Population
- 53
- Data points
Monona County at a glance
- $71,675
- Median household income
- $147,508
- Median home value
- 46.2
- Median age
- 77.2%
- Owner-occupied
- 6,781
- Housing units
Income, home value, and age are population-weighted averages of the ZIP-level medians in the file. Counts are exact.
Top 5 Monona County ZIP codes by median household income| # | ZIP | City | Population | Homeowner % | Median HH $ |
|---|
| 1 | 51056 | Smithland | 346 | 92.5% | $103,313 |
| 2 | 51010 | Castana | 425 | 87.5% | $89,063 |
| 3 | 51523 | Blencoe | 379 | 79.3% | $82,625 |
| 4 | 51063 | Whiting | 1,072 | 70% | $80,750 |
| 5 | 51026 | Hornick | 910 | 93.5% | $80,500 |
Top 5 Monona County ZIP codes by population| # | ZIP | City | Population | Homeowner % | Median HH $ |
|---|
| 1 | 51040 | Onawa | 3,500 | 75.3% | $71,179 |
| 2 | 51529 | Dunlap | 1,732 | 73.1% | $61,599 |
| 3 | 51034 | Mapleton | 1,674 | 77.6% | $66,375 |
| 4 | 51055 | Sloan | 1,346 | 69.9% | $72,143 |
| 5 | 51063 | Whiting | 1,072 | 70% | $80,750 |
Top 5 Monona County ZIP codes by Homeowner GDP| # | ZIP | City | Population | Homeowner % | Median HH $ | Homeowner GDP |
|---|
| 1 | 51040 | Onawa | 3,500 | 75.3% | $71,179 | $83.4M |
| 2 | 51529 | Dunlap | 1,732 | 73.1% | $61,599 | $37.1M |
| 3 | 51034 | Mapleton | 1,674 | 77.6% | $66,375 | $37M |
| 4 | 51055 | Sloan | 1,346 | 69.9% | $72,143 | $27.6M |
| 5 | 51026 | Hornick | 910 | 93.5% | $80,500 | $26.6M |
Homeowner GDP = owner-occupied units × median household income — a proxy for aggregate homeowner spending power in a ZIP, useful for scoring market opportunity. Not an official economic statistic.
Densest: 51040 (Onawa) at 27 people/sq mi. Least dense: 51019 (Danbury) at 5 people/sq mi.
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