Osceola County, Iowa ZIP codes
5 ZIP codes are in Osceola County, plus 3 that cross in from neighboring counties.
- ZIP codes
- 5
- Population in these ZIPs
- 5,917
- Avg. median income
- $66,300population-weighted
- Cities & towns
- 5
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ZIP codes in Osceola County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 51232 | Ashton | 658 | $82,917 | $177,700 |
| 51249 | Sibley | 3,564 | $61,500 | $175,100 |
| 51345 | Harris | 347 | $54,301 | $190,300 |
| 51350 | Melvin | 383 | $77,250 | $128,200 |
| 51354 | Ocheyedan | 965 | $72,639 | $164,300 |
ZIP codes partly in Osceola County
These ZIP codes are mostly in a neighboring county but cover part of Osceola County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 51243 | Little Rock | Lyon County | 735 | $83,750 | $183,900 |
| 51248 | Sanborn | O'Brien County | 1,534 | $64,375 | $208,300 |
| 51346 | Hartley | O'Brien County | 2,247 | $72,426 | $177,900 |
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 Osceola County
Nearby counties
Frequently asked questions
How many ZIP codes are in Osceola County, Iowa?
5 ZIP codes are mainly in Osceola County, and 3 more ZIP codes from neighboring areas reach partly into it.
What cities are in Osceola County?
ZIP codes in Osceola County use the city names Ashton, Harris, Melvin, Ocheyedan and Sibley.