| Locality | Post Code |
|---|---|
| Asbury, Dubuque | 52002 |
| Bankston, Dubuque | 52045 |
| Bernard, Dubuque | 52032 |
| Cascade, Dubuque | 52033 |
| Center Grove, Dubuque | 52001 |
| Centralia, Dubuque | 52068 |
| Dubuque, Dubuque | 52001, 52002, 52003 |
| Durango, Dubuque | 52039 |
| Dyersville, Dubuque | 52040 |
| Eagle Point, Dubuque | 52001 |
| Epworth, Dubuque | 52045 |
| Farley, Dubuque | 52046 |
| Fillmore, Dubuque | 52033 |
| Holy Cross, Dubuque | 52053 |
| Julien, Dubuque | 52001 |
| Key West, Dubuque | 52001 |
| Luxemburg, Dubuque | 52056 |
| Massey, Dubuque | 52001 |
| New Vienna, Dubuque | 52065 |
| Otter Creek, Dubuque | 52079 |
| Peosta, Dubuque | 52068 |
| Petersburg, Dubuque | 52040 |
| Rockdale, Dubuque | 52001 |
| Sageville, Dubuque | 52001 |
| Shawondasse, Dubuque | 52001 |
| Sherrill, Dubuque | 52073 |