Sioux City
- County:
- Woodbury County
- County Seat:
- Yes
- Area (mi²):
- 59.387
- State:
- Iowa
Sioux City is a city located in Woodbury County, Iowa. Sioux City has a 2026 population of 86,875. It is also the county seat of Woodbury County. Sioux City is currently growing at a rate of 0.68% annually and its population has increased by 1.15% since the most recent census, which recorded a population of 85,888 in 2020.