How many people live in Delaware County, OH?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 238,000 people living in Delaware County, OH. That makes Delaware County the 11th-most populous county in Ohio. It is home to 2% of people living in the state.
238K
population of Delaware County, OH (2024)
2%
County share of the Ohio population (2024)
About 238,000 people lived in Delaware County, OH in 2024.
Population estimates, 2000–2024
What are Delaware County, OH’s age demographics?
About 38,000 Delaware County residents are aged 65 and older in 2024. That represents 16% of its population. For comparison, the age group represents 19.1% of Ohio’s population and 18% in the US overall.
Another 56,800 Delaware County residents, or 23.9% 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 higher share of Delaware County, OH's population is aged 45–64 than the US as a whole.
Population estimates by age group, (2024)
What are Delaware County, OH’s racial and ethnic demographics?
Non-Hispanic white residents make up 78.5% of the Delaware County population, higher than the national share of 57.5%. Delaware County also has a larger share of people identifying as non-Hispanic Asian (10.4%) than the US overall (6.5%).
In contrast, Delaware County’s Hispanic population accounts for 3.8%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 4.9% of the county, compared with 12.6% 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.
Delaware County, OH has a higher share of a non-Hispanic Asian population than Ohio as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Delaware County, OH is Delaware with about 43,100 residents in 2024.
Cities and towns in Delaware County, OH ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Delaware (pt.) | 43,073 |
| 2. | Powell (pt.) | 14,353 |
| 3. | Sunbury (pt.) | 9,683 |
| 4. | Westerville (pt.) | 9,257 |
| 5. | Columbus (pt.) | 8,135 |
| 6. | Columbus (pt.) | 7,718 |
| 7. | Harlem | 5,135 |
| 8. | Dublin (pt.) | 4,364 |
| 9. | Kingston | 2,709 |
| 10. | Trenton | 2,573 |
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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.
