9 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 52057 | Manchester | 7,883 |
| 52040 | Dyersville | 5,508 |
| 52041 | Earlville | 1,796 |
| 52237 | Hopkinton | 1,526 |
| 52330 | Ryan | 1,186 |
| 52223 | Delhi | 1,170 |
| 52038 | Dundee | 522 |
| 52050 | Greeley | 477 |
| 52036 | Delaware | 124 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 9 ZCTAs in Delaware County, Iowa (US Census).