10 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 64506 | Saint Joseph | 22,107 |
| 64507 | Saint Joseph | 14,159 |
| 64503 | Saint Joseph | 11,921 |
| 64501 | Saint Joseph | 10,354 |
| 64504 | Saint Joseph | 10,286 |
| 64443 | Easton | 1,647 |
| 64401 | Agency | 1,604 |
| 64440 | De Kalb | 876 |
| 64448 | Faucett | 862 |
| 64484 | Rushville | 843 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 10 ZCTAs in Buchanan County, Missouri (US Census).