| Zip Code | City | Population ↓ |
|---|---|---|
| 52240 | Iowa City | 35,074 |
| 52241 | Coralville | 23,250 |
| 52317 | North Liberty | 23,097 |
| 52245 | Iowa City | 22,853 |
| 52246 | Iowa City | 22,308 |
| 52333 | Solon | 7,295 |
| 52340 | Tiffin | 6,128 |
| 52247 | Kalona | 5,914 |
| 52242 | Iowa City | 4,688 |
| 52338 | Swisher | 3,934 |
| 52322 | Oxford | 2,266 |
| 52755 | Lone Tree | 2,092 |
| 52235 | Hills | 974 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 13 ZCTAs in Johnson County, Iowa (US Census).