13 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 52001 | Dubuque | 43,064 |
| 52002 | Dubuque | 17,931 |
| 52003 | Dubuque | 13,735 |
| 52068 | Peosta | 4,582 |
| 52045 | Epworth | 2,872 |
| 52046 | Farley | 2,628 |
| 52073 | Sherrill | 1,410 |
| 52032 | Bernard | 1,277 |
| 52053 | Holy Cross | 1,160 |
| 52039 | Durango | 1,005 |
| 52078 | Worthington | 805 |
| 52065 | New Vienna | 729 |
| 52056 | Luxemburg | 230 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 13 ZCTAs in Dubuque County, Iowa (US Census).