Monona County, Iowa ZIP codes
9 ZIP codes are in Monona County, plus 6 that cross in from neighboring counties.
- ZIP codes
- 9
- Population in these ZIPs
- 8,715
- Avg. median income
- $71,500population-weighted
- Cities & towns
- 9
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ZIP codes in Monona County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 51010 | Castana | 425 | $89,063 | $201,100 |
| 51034 | Mapleton | 1,674 | $66,375 | $172,200 |
| 51040 | Onawa | 3,500 | $71,179 | $157,000 |
| 51051 | Rodney | 39 | $51,563 | $170,800 |
| 51060 | Ute | 706 | $52,500 | $116,300 |
| 51063 | Whiting | 1,072 | $80,750 | $181,900 |
| 51523 | Blencoe | 379 | $82,625 | $140,500 |
| 51558 | Moorhead | 549 | $77,417 | $169,300 |
| 51572 | Soldier | 371 | $69,500 | $120,500 |
ZIP codes partly in Monona County
These ZIP codes are mostly in a neighboring county but cover part of Monona County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 51019 | Danbury | Woodbury County | 448 | $75,000 | $197,300 |
| 51026 | Hornick | Woodbury County | 910 | $80,500 | $241,400 |
| 51055 | Sloan | Woodbury County | 1,346 | $72,143 | $242,300 |
| 51056 | Smithland | Woodbury County | 346 | $103,313 | $164,900 |
| 51529 | Dunlap | Harrison County | 1,732 | $61,599 | $199,200 |
| 51545 | Little Sioux | Harrison County | 267 | $70,313 | $92,100 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Monona County
Nearby counties
Frequently asked questions
How many ZIP codes are in Monona County, Iowa?
9 ZIP codes are mainly in Monona County, and 6 more ZIP codes from neighboring areas reach partly into it.
What cities are in Monona County?
ZIP codes in Monona County use the city names Blencoe, Castana, Mapleton, Moorhead, Onawa, Rodney, Soldier, Ute and Whiting.