Union County, South Dakota
Chicago and Northwestern Railroad depot in Beresford, South Dakota
Location in the state of South Dakota
South Dakota's location in the U.S.
Founded	April 10, 1862
Seat	Elk Point
Largest city	North Sioux City
Area
• Total	467 sq mi (1,210 km2)
• Land	461 sq mi (1,194 km2)
• Water	6.6 sq mi (17 km2), 1.4
Time zone	Central: UTC-6/-5
Website	unioncountysd.org
Footnotes: For infobox source see

County Well Data

Well ID	Operator Name	Well Type	Well Status
40-127-05000	General Crude Oil Co.	Dry Hole	Abandoned
40-127-05001	A. Wagner	Dry Hole	Abandoned
40-127-05002	A. Wagner	Dry Hole	Abandoned
40-127-05003	A. Wagner	Dry Hole	Abandoned
40-127-05004	A. Wagner	Dry Hole	Abandoned
40-127-20001	Amos Eidem	Dry Hole	Abandoned

For data sources see