22 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hamilton township | 1 | 2,304 | 2,293 | 0% | 67 | 34.44 | Township |
| Hamilton | 2 | 1,694 | 1,693 | 0% | 1,153 | 1.47 | City |
| Grant township | 3 | 1,415 | 1,388 | 0.21% | 39 | 35.87 | Township |
| Davis township | 4 | 1,106 | 1,079 | 0.27% | 31 | 35.41 | Township |
| Kidder township | 5 | 1,019 | 1,000 | -0.1% | 28 | 35.81 | Township |
| Braymer | 6 | 764 | 739 | 0.66% | 1,293 | 0.59 | City |
| Rockford township | 7 | 614 | 594 | 0.49% | 17 | 35.54 | Township |
| Kingston township | 8 | 557 | 552 | 0% | 16 | 34.95 | Township |
| Polo | 9 | 506 | 511 | -0.2% | 821 | 0.62 | City |
| Vibbard | 10 | 461 | 276 | 7.21% | 329 | 1.40 | CDP |
| Breckenridge township | 11 | 439 | 434 | 0.23% | 12 | 35.19 | Township |
| Mirabile township | 12 | 368 | 352 | 0.82% | 10 | 35.51 | Township |
| Gomer township | 13 | 337 | 327 | 0.3% | 9 | 35.99 | Township |
| Kingston | 14 | 295 | 297 | 0% | 568 | 0.52 | City |
| Kidder | 15 | 274 | 266 | 0.74% | 682 | 0.40 | City |
| New York township | 16 | 259 | 252 | 0.39% | 7 | 35.89 | Township |
| Breckenridge | 17 | 250 | 252 | 0% | 455 | 0.55 | City |
| Lake Arrowhead | 18 | 241 | 212 | 7.11% | 188 | 1.28 | CDP |
| Excelsior Estates | 19 | 235 | 222 | 1.29% | 975 | 0.24 | Village |
| Cowgill | 20 | 175 | 169 | 0.57% | 732 | 0.24 | City |
| Hamilton township | 21 | 122 | 121 | 0% | 3 | 42.30 | Township |
| Elmira | 22 | 40 | 39 | 0% | 548 | 0.07 | Village |
Hamilton township is the largest city in Caldwell County, with a population of 2,304.
Elmira is the smallest city in Caldwell County.
There are 22 cities in Caldwell County, Missouri.