11 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Independence | 1 | 6,357 | 6,084 | 0.73% | 1,055 | 6 | City |
| Jesup | 2 | 2,554 | 2,514 | 0.27% | 1,387 | 2 | City |
| Fairbank | 3 | 1,144 | 1,110 | 0.53% | 1,556 | 1 | City |
| Winthrop | 4 | 808 | 825 | -0.37% | 1,021 | 1 | City |
| Hazleton | 5 | 711 | 711 | 0% | 890 | 1 | City |
| Quasqueton | 6 | 592 | 576 | 0.51% | 524 | 1 | City |
| Lamont | 7 | 427 | 432 | -0.23% | 730 | 1 | City |
| Brandon | 8 | 328 | 336 | -0.3% | 1,012 | 0 | City |
| Rowley | 9 | 261 | 269 | -0.38% | 673 | 0 | City |
| Aurora | 10 | 164 | 166 | 0% | 310 | 1 | City |
| Stanley | 11 | 86 | 86 | 0% | 424 | 0 | City |
Independence is the largest city in Buchanan County, with a population of 6,357.
Stanley is the smallest city in Buchanan County, with a population of 86.
There are 11 cities in Buchanan County, Iowa.