How many people live in Defiance County, OH?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 38,600 people living in Defiance County, OH. That makes Defiance County the 64th-most populous county in Ohio. It is home to 0.32% of people living in the state.
38.6K
population of Defiance County, OH (2024)
0.32%
County share of the Ohio population (2024)
About 38,600 people lived in Defiance County, OH in 2024.
Population estimates, 2000–2024
What are Defiance County, OH’s age demographics?
About 8,100 Defiance County, OH residents are aged 65 and older in 2024. That represents 20.8% of its population. For comparison, the age group represents 19.1% of Ohio’s population and 18% in the US overall.
Another 8,500 Defiance County residents, or 22% 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 Defiance County, OH's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Defiance County, OH’s racial and ethnic demographics?
Non-Hispanic white residents make up 84.1% of the Defiance County, OH population, higher than the national share of 57.5%.
In contrast, Defiance County’s non-Hispanic Black or African American population accounts for 1.8%, below the 12.6% nationwide, and the Hispanic population makes up 12.1% 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.
Defiance County, OH has a higher share of a non-Hispanic white population than Ohio as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Defiance County, OH is Defiance with about 11,600 residents in 2024.
Cities and towns in Defiance County, OH ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Defiance (pt.) | 11,638 |
| 2. | Defiance (pt.) | 3,765 |
| 3. | Hicksville | 3,447 |
| 4. | Highland | 2,298 |
| 5. | Defiance (pt.) | 1,777 |
| 6. | Tiffin | 1,594 |
| 7. | Milford | 1,117 |
| 8. | Mark | 910 |
| 9. | Farmer | 888 |
| 10. | Adams | 881 |
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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.
