5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Clarksville | 1 | 9,725 | 9,367 | 0.62% | 534 | 18 | City |
| Lamar | 2 | 1,794 | 1,718 | 0.73% | 389 | 5 | City |
| Coal Hill | 3 | 814 | 813 | 0% | 290 | 3 | City |
| Knoxville | 4 | 670 | 651 | 0.45% | 210 | 3 | Town |
| Hartman | 5 | 515 | 512 | 0.19% | 326 | 2 | City |
Clarksville is the largest city in Johnson County, with a population of 9,725.
Hartman is the smallest city in Johnson County, with a population of 515.
There are 5 cities in Johnson County, Arkansas.