How many people live in Hamilton County, OH?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 837,400 people living in Hamilton County, OH. That makes Hamilton County the third-most populous county in Ohio. It is home to 7% of people living in the state.
837K
population of Hamilton County, OH (2024)
7%
County share of the Ohio population (2024)
About 837,400 people lived in Hamilton County, OH in 2024.
Population estimates, 2000–2024
What are Hamilton County, OH’s age demographics?
About 145,000 Hamilton County, OH residents are aged 65 and older in 2024. That represents 17.3% of its population. For comparison, the age group represents 19.1% of Ohio’s population and 18% in the US overall.
Another 189,700 Hamilton County residents, or 22.7% of the population, were children under 18. For comparison, the age group represents 21.7% of Ohio’s population and 21.6% in the US overall.
A lower share of Hamilton County, OH's population is aged 45–64 than the US as a whole.
Population estimates by age group, (2024)
What are Hamilton County, OH’s racial and ethnic demographics?
Non-Hispanic white residents make up 62.4% of the Hamilton County, OH population, higher than the national share of 57.5%. Hamilton County also has a larger share of people identifying as non-Hispanic Black or African American (26.1%) than the US overall (12.6%).
In contrast, Hamilton County’s Hispanic population accounts for 5.4%, below the 20% nationwide, and the non-Hispanic Asian population makes up 3.1% 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.
Hamilton County, OH has a higher share of a non-Hispanic Black or African American population than Ohio as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Hamilton County, OH is Cincinnati with about 314,900 residents in 2024.
Cities and towns in Hamilton County, OH ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Cincinnati | 314,915 |
| 2. | Green | 60,349 |
| 3. | Colerain | 59,340 |
| 4. | Anderson | 44,080 |
| 5. | Springfield | 35,790 |
| 6. | Delhi | 28,860 |
| 7. | Forest Park | 20,033 |
| 8. | Sycamore | 19,606 |
| 9. | Norwood | 19,455 |
| 10. | Symmes | 15,699 |
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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.
