| Zip Code | City | Population ↓ |
|---|---|---|
| 57078 | Yankton | 20,266 |
| 57037 | Irene | 1,008 |
| 57031 | Gayville | 766 |
| 57046 | Mission Hill | 702 |
| 57072 | Volin | 529 |
| 57040 | Lesterville | 299 |
| 57067 | Utica | 255 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 7 ZCTAs in Yankton County, South Dakota (US Census).