10 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 50644 | Independence | 8,475 |
| 50629 | Fairbank | 2,335 |
| 50682 | Winthrop | 1,700 |
| 50641 | Hazleton | 1,665 |
| 52210 | Brandon | 975 |
| 52326 | Quasqueton | 745 |
| 52329 | Rowley | 677 |
| 50650 | Lamont | 664 |
| 50607 | Aurora | 404 |
| 50654 | Masonville | 335 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 10 ZCTAs in Buchanan County, Iowa (US Census).