Union County Map
The County of Union is located in the State of South Dakota. Find directions to Union County, browse local businesses, landmarks, get current traffic estimates, road conditions, and more. According to the 2020 US Census the Union County population is estimated at 16,192 people. The Union County time zone is Central Daylight Time which is 6 hours behind Coordinated Universal Time (UTC).
Nearby counties include Plymouth County, Sioux County, Woodbury County, Dakota County, Dixon County, Clay County, Lincoln County.
Top cities include Beresford, Jefferson, Dakota Dunes, Elk Point, North Sioux City