13 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 52001 | Dubuque | 42,895 |
| 52002 | Dubuque | 17,871 |
| 52003 | Dubuque | 13,820 |
| 52068 | Peosta | 4,483 |
| 52045 | Epworth | 2,950 |
| 52046 | Farley | 2,663 |
| 52073 | Sherrill | 1,496 |
| 52032 | Bernard | 1,407 |
| 52053 | Holy Cross | 1,317 |
| 52039 | Durango | 908 |
| 52065 | New Vienna | 824 |
| 52078 | Worthington | 801 |
| 52056 | Luxemburg | 222 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 13 ZCTAs in Dubuque County, Iowa (US Census).