Union 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 Alcester | no seat recorded | 807 |
| City of Beresford | no seat recorded | 2 k |
| City of Elk Point | Elk Point | 2 k |
| City of Jefferson | no seat recorded | 547 |
| City of North Sioux City | no seat recorded | 3 k |
| Township of Alcester | no seat recorded | |
| Township of Big Sioux | no seat recorded | |
| Township of Big Springs | no seat recorded | |
| Township of Brule | no seat recorded | |
| Township of Civil Bend | no seat recorded | |
| Township of Elk Point | no seat recorded | |
| Township of Emmet | no seat recorded | |
| Township of Jefferson | no seat recorded | |
| Township of Prairie | no seat recorded | |
| Township of Sioux Valley | no seat recorded | |
| Township of Spink | no seat recorded | |
| Township of Virginia | no seat recorded | |
| Unorganized Territory of Richland | no seat recorded |
Nothing has been written about Union County here, and neither Wikipedia nor Wikivoyage has an article we could draw one from. If you know the place, that makes you a better source than anything we have. Tell us what is worth knowing and where you got it.
We show Elk Point as the capital of Union County. If that is wrong, tell us what it should be and where you read it.
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