Union County, South Dakota

4 ZIP codes · 460.76 sq mi of land · FIPS 46127

Population17,081
StateSouth Dakota
FIPS code46127
Time zoneCentral
Area code605
Land area460.76 sq mi
Center (lat, long)42.8311, -96.6508

Cities and towns (largest first)

AlcesterElk PointJeffersonNorth Sioux City

ZIP codes in Union County

57001 Alcester57025 Elk Point57038 Jefferson57049 North Sioux City

Population: U.S. Census Bureau, ACS 5-year estimates, 2024.