How many people live in Hamilton County, IA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 14,900 people living in Hamilton County, IA. That makes Hamilton County the 51st-most populous county in Iowa. It is home to 0.46% of people living in the state.
14.9K
population of Hamilton County, IA (2024)
0.46%
County share of the Iowa population (2024)
About 14,900 people lived in Hamilton County, IA in 2024.
Population estimates, 2000–2024
What are Hamilton County, IA’s age demographics?
About 3,200 Hamilton County, IA residents are aged 65 and older in 2024. That represents 21.9% of its population. For comparison, the age group represents 18.9% of Iowa’s population and 18% in the US overall.
Another 3,500 Hamilton County, IA residents, or 23.7% 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 lower share of Hamilton County, IA's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Hamilton County, IA’s racial and ethnic demographics?
Non-Hispanic white residents make up 83.7% of the Hamilton County, IA population, higher than the national share of 57.5%.
In contrast, Hamilton County’s non-Hispanic Black or African American population accounts for 0.94%, below the 12.6% nationwide, and the Hispanic population makes up 10.9% of the county, compared with 20% 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.
Hamilton 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 Hamilton County, IA is Webster City with about 7,800 residents in 2024.
Cities and towns in Hamilton County, IA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Webster City | 7,763 |
| 2. | Jewell Junction | 1,234 |
| 3. | Stratford (pt.) | 668 |
| 4. | Ellsworth | 495 |
| 5. | Stanhope | 354 |
| 6. | Williams | 299 |
| 7. | Kamrar | 178 |
| 8. | Blairsburg | 175 |
| 9. | Randall | 156 |
| 10. | Balance of Hamilton County | 3,534 |
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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.
