Yankton County is a district of South Dakota.
Boundaries: United States Census Bureau, MAF/TIGER Database (https://www.census.gov/geographies/mapping-files/time-series/geo/carto-boundary-file.html) via geoBoundaries, public domain
| City of Yankton | Yankton | 14 k |
| Town of Gayville | no seat recorded | 407 |
| Town of Lesterville | no seat recorded | 127 |
| Town of Mission Hill | no seat recorded | 177 |
| Town of Utica | no seat recorded | 65 |
| Town of Volin | no seat recorded | 161 |
| Township of Gayville | no seat recorded | |
| Township of Jamesville | no seat recorded | |
| Township of Marindahl | no seat recorded | |
| Township of Mayfield | no seat recorded | |
| Township of Mission Hill | no seat recorded | |
| Township of Turkey Valley | no seat recorded | |
| Township of Utica | no seat recorded | |
| Township of Volin | no seat recorded | |
| Township of Walshtown | no seat recorded | |
| Unorganized Territory of Southeast Yankton | no seat recorded | |
| Unorganized Territory of West Yankton | no seat recorded |
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