Sioux County, Iowa

Sioux County, Iowa
The Sioux County Courthouse in Orange City
Location within the U.S. state of Iowa
Coordinates: 43°04′57″N 96°10′41″W / 43.082618°N 96.177980°W / 43.082618; -96.177980
Country United States
State Iowa
FoundedJanuary 15, 1851 (created)
January 1, 1860 (organized)
Named afterSioux people
SeatOrange City
Largest citySioux Center
Area
 • Total
768.993 sq mi (1,991.68 km2)
 • Land767.911 sq mi (1,988.88 km2)
 • Water1.082 sq mi (2.80 km2)  0.14%
Population
 (2020)
 • Total
35,872
 • Estimate 
(2024)
36,554
 • Density46.714/sq mi (18.036/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Area code712
Congressional district4th
Websitesiouxcountyia.gov
  • Iowa county number 84

Sioux County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 35,872. The county seat is Orange City and the largest city is Sioux Center.