10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Warrensburg | 1 | 19,893 | 19,343 | 0.56% | 2,115 | 9 | City |
| Whiteman AFB | 2 | 4,510 | 4,092 | 2.97% | 675 | 7 | CDP |
| Knob Noster | 3 | 2,962 | 2,784 | 1.23% | 1,028 | 3 | City |
| Holden | 4 | 2,315 | 2,210 | 0.92% | 960 | 2 | City |
| Leeton | 5 | 542 | 532 | 0.37% | 1,050 | 1 | City |
| Lake Lafayette | 6 | 309 | 279 | 1.98% | 482 | 1 | City |
| Chilhowee | 7 | 294 | 289 | 0.34% | 814 | 0 | Town |
| Kingsville | 8 | 247 | 242 | 0.41% | 799 | 0 | City |
| Centerview | 9 | 193 | 187 | 0.52% | 985 | 0 | City |
| Aullville | 10 | 80 | 79 | 0% | 301 | 0 | Village |
Warrensburg is the largest city in Johnson County, with a population of 19,893.
Aullville is the smallest city in Johnson County, with a population of 80.
There are 10 cities in Johnson County, Missouri.