| Zip Code | City | Population ↓ |
|---|---|---|
| 72830 | Clarksville | 16,138 |
| 72846 | Lamar | 3,595 |
| 72840 | Hartman | 2,404 |
| 72845 | Knoxville | 950 |
| 72832 | Coal Hill | 713 |
| 72839 | Hagarville | 587 |
| 72854 | Ozone | 512 |
| 72852 | Oark | 140 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Johnson County, Arkansas (US Census).