Buchanan County, Iowa ZIP codes
10 ZIP codes are in Buchanan County, plus 6 that cross in from neighboring counties.
- ZIP codes
- 10
- Population in these ZIPs
- 17,792
- Avg. median income
- $78,900population-weighted
- Cities & towns
- 10
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Buchanan County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 50607 | Aurora | 403 | $54,583 | $231,800 |
| 50629 | Fairbank | 2,082 | $103,106 | $267,400 |
| 50641 | Hazleton | 1,950 | $67,115 | $170,300 |
| 50644 | Independence | 8,419 | $80,026 | $210,200 |
| 50650 | Lamont | 648 | $57,500 | $179,700 |
| 50654 | Masonville | 275 | $53,264 | $305,800 |
| 50682 | Winthrop | 1,692 | $89,375 | $234,700 |
| 52210 | Brandon | 958 | $70,714 | $240,100 |
| 52326 | Quasqueton | 694 | $76,250 | $156,400 |
| 52329 | Rowley | 671 | $57,500 | $250,000 |
ZIP codes partly in Buchanan County
These ZIP codes are mostly in a neighboring county but cover part of Buchanan County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 50626 | Dunkerton | Black Hawk County | 1,468 | $84,306 | $238,900 |
| 50648 | Jesup | Black Hawk County | 4,269 | $95,353 | $264,000 |
| 50662 | Oelwein | Fayette County | 6,576 | $48,646 | $110,500 |
| 50671 | Stanley | Fayette County | 182 | $57,212 | $230,800 |
| 52218 | Coggon | Linn County | 1,413 | $82,344 | $242,100 |
| 52352 | Walker | Linn County | 1,833 | $92,321 | $314,000 |
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 Buchanan County
Nearby counties
Frequently asked questions
How many ZIP codes are in Buchanan County, Iowa?
10 ZIP codes are mainly in Buchanan County, and 6 more ZIP codes from neighboring areas reach partly into it.
What cities are in Buchanan County?
ZIP codes in Buchanan County use the city names Aurora, Brandon, Fairbank, Hazleton, Independence, Lamont, Masonville, Quasqueton, Rowley and Winthrop.