| 52201 Ainsworth | 319 | Washington County | Iowa (IA) |
| 52201 Haskins | 319 | Washington County | Iowa (IA) |
| 52247 Frytown | 319 | Washington County | Iowa (IA) |
| 52247 Joetown | 319 | Washington County | Iowa (IA) |
| 52247 Kalona | 319 | Washington County | Iowa (IA) |
| 52247 Williamstown | 319 | Washington County | Iowa (IA) |
| 52327 Riverside | 319 | Washington County | Iowa (IA) |
| 52353 Grace Hill | 319 | Washington County | Iowa (IA) |
| 52353 Washington | 319 | Washington County | Iowa (IA) |
| 52356 Wellman | 319 | Washington County | Iowa (IA) |
| 52356 Daytonville | 319 | Washington County | Iowa (IA) |
| 52359 West Chester | 319 | Washington County | Iowa (IA) |
| 52540 Brighton | 319 | Washington County | Iowa (IA) |
| 52540 East Pleasant Plain | 319 | Washington County | Iowa (IA) |
| 52540 Germanville | 319 | Washington County | Iowa (IA) |
| 52540 Pleasant Plain | 319 | Washington County | Iowa (IA) |
| 52621 Crawfordsville | 319 | Washington County | Iowa (IA) |
| 52621 Crawfordsvlle | 319 | Washington County | Iowa (IA) |
| 52621 Wyman | 319 | Washington County | Iowa (IA) |