Union County
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- Population
- 17,081
- Area
- 460.76 sq mi (1,193.35 km²), 6.37 sq mi water
- Median age
- 41.5
- Households
- 7,310
- Persons per household
- 2.3
- Median household income
- $89,636
- Median house value
- $301,100
Demographics: 2020–2024 ACS
Overnight
49°F
Mostly Clear
Sunday
71°F
Sunny
Sunday Night
47°F
Mostly Clear
Monday
71°F
Sunny
Cities & Towns in Union County
AlcesterAlcester TownshipBeresfordBig Sioux TownshipBig Springs TownshipBrule TownshipCivil Bend TownshipDakota DunesElk PointElk Point TownshipEmmet TownshipJeffersonJefferson TownshipNorth Sioux CityPrairie TownshipRichlandSioux Valley TownshipSpink TownshipUnincorporated Union CountyVirginia Township