| ZIP | County | State | Area Code | Time Zone |
| 52401 | Linn | IA | 319 | CST |
| 52402 | Linn | IA | 319 | CST |
| 52403 | Linn | IA | 319 | CST |
| 52404 | Linn | IA | 319 | CST |
| 52405 | Linn | IA | 319 | CST |
| 52406 | Linn | IA | 319 | CST |
| 52407 | Linn | IA | 319 | CST |
| 52408 | Linn | IA | 319 | CST |
| 52409 | Linn | IA | 319 | CST |
| 52410 | Linn | IA | 319 | CST |
| 52411 | Linn | IA | 319 | CST |
| 52497 | Linn | IA | 319 | CST |
| 52498 | Linn | IA | 319 | CST |
| 52499 | Linn | IA | 319 | CST |