O'Brien County, Iowa ZIP codes
8 ZIP codes are in O'Brien County, plus 6 that cross in from neighboring counties.
- ZIP codes
- 8
- Population in these ZIPs
- 9,215
- Avg. median income
- $75,700population-weighted
- Cities & towns
- 8
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ZIP codes in O'Brien County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 51009 | Calumet | 113 | $58,750 | $83,300 |
| 51022 | Granville | 960 | $96,505 | $274,900 |
| 51046 | Paullina | 1,326 | $84,125 | $179,300 |
| 51058 | Sutherland | 1,096 | $63,036 | $159,600 |
| 51231 | Archer | 562 | $108,058 | $226,900 |
| 51245 | Primghar | 1,377 | $69,531 | $186,700 |
| 51248 | Sanborn | 1,534 | $64,375 | $208,300 |
| 51346 | Hartley | 2,247 | $72,426 | $177,900 |
ZIP codes partly in O'Brien County
These ZIP codes are mostly in a neighboring county but cover part of O'Brien County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 51029 | Larrabee | Cherokee County | 261 | $86,042 | $119,800 |
| 51047 | Peterson | Clay County | 693 | $101,000 | $168,200 |
| 51201 | Sheldon | Sioux County | 6,430 | $68,799 | $226,100 |
| 51232 | Ashton | Osceola County | 658 | $82,917 | $177,700 |
| 51238 | Hospers | Sioux County | 1,502 | $74,000 | $265,400 |
| 51350 | Melvin | Osceola County | 383 | $77,250 | $128,200 |
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 O'Brien County
Nearby counties
Frequently asked questions
How many ZIP codes are in O'Brien County, Iowa?
8 ZIP codes are mainly in O'Brien County, and 6 more ZIP codes from neighboring areas reach partly into it.
What cities are in O'Brien County?
ZIP codes in O'Brien County use the city names Archer, Calumet, Granville, Hartley, Paullina, Primghar, Sanborn and Sutherland.