| City | County | 2026 Pop. ↓ |
|---|---|---|
| Kansas City | Jackson County | 523,322 |
| Kirkwood | St. Louis County | 29,296 |
| Kirksville | Adair County | 17,934 |
| Kearney | Clay County | 11,477 |
| Kennett | Dunklin County | 10,036 |
| Knob Noster | Johnson County | 3,037 |
| Kimberling City | Stone County | 2,348 |
| Kahoka | Clark County | 1,961 |
| Kissee Mills | Taney County | 1,199 |
| King City | Gentry County | 854 |
| Kelso | Scott County | 550 |
| Keytesville | Chariton County | 446 |
| Kingston | Caldwell County | 293 |
| Kidder | Caldwell County | 284 |
| Kinloch | St. Louis County | 260 |
| Kingsville | Johnson County | 253 |
| Kirbyville | Taney County | 206 |
| Koshkonong | Oregon County | 198 |
| Knox City | Knox County | 185 |
| Kingdom City | Callaway County | 136 |
| Kimmswick | Jefferson County | 132 |
| Knob Lick | St. Francois County | 97 |