How many people live in Sioux County, IA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 36,600 people living in Sioux County, IA. That makes Sioux County the 19th-most populous county in Iowa. It is home to 1.1% of people living in the state.
36.6K
population of Sioux County, IA (2024)
1.1%
County share of the Iowa population (2024)
About 36,600 people lived in Sioux County, IA in 2024.
Population estimates, 2000–2024
What are Sioux County, IA’s age demographics?
About 6,300 Sioux County residents are aged 65 and older in 2024. That represents 17.3% of its population. For comparison, the age group represents 18.9% of Iowa’s population and 18% in the US overall.
Another 9,800 Sioux County residents, or 26.8% of the population, were children under 18. For comparison, the age group represents 22.5% of Iowa’s population and 21.6% in the US overall.
A higher share of Sioux County, IA's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Sioux County, IA’s racial and ethnic demographics?
Non-Hispanic white residents make up 82.1% of the Sioux County, IA population, higher than the national share of 57.5%.
In contrast, Sioux County’s non-Hispanic Black or African American population accounts for 0.64%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 0.92% of the county, compared with 6.5% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Sioux County, IA has a higher share of a Hispanic population than Iowa as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Sioux County, IA is Sioux Center with about 8,700 residents in 2024.
Cities and towns in Sioux County, IA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Sioux Center | 8,675 |
| 2. | Orange City | 6,547 |
| 3. | Rock Valley | 4,024 |
| 4. | Hawarden | 2,630 |
| 5. | Hull | 2,459 |
| 6. | Alton | 1,248 |
| 7. | Hospers | 703 |
| 8. | Boyden | 694 |
| 9. | Ireton | 571 |
| 10. | Granville | 302 |
Keep exploring
Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
