How many people live in Miami County, OH?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 112,000 people living in Miami County, OH. That makes Miami County the 25th-most populous county in Ohio. It is home to 0.94% of people living in the state.
112K
population of Miami County, OH (2024)
0.94%
County share of the Ohio population (2024)
About 112,000 people lived in Miami County, OH in 2024.
Population estimates, 2000–2024
What are Miami County, OH’s age demographics?
About 22,600 Miami County, OH residents are aged 65 and older in 2024. That represents 20.2% of its population. For comparison, the age group represents 19.1% of Ohio’s population and 18% in the US overall.
Another 25,200 Miami County residents, or 22.5% 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 Miami County, OH's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Miami County, OH’s racial and ethnic demographics?
Non-Hispanic white residents make up 90% of the Miami County, OH population, higher than the national share of 57.5%.
In contrast, Miami County’s Hispanic population accounts for 2.2%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 3% 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.
Miami 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 Miami County, OH is Troy with about 26,600 residents in 2024.
Cities and towns in Miami County, OH ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Troy (pt.) | 26,648 |
| 2. | Piqua | 20,940 |
| 3. | Tipp City (pt.) | 10,596 |
| 4. | Huber Heights (pt.) | 5,789 |
| 5. | West Milton | 4,855 |
| 6. | Covington | 2,622 |
| 7. | Springcreek | 2,219 |
| 8. | Elizabeth | 1,709 |
| 9. | Washington | 1,523 |
| 10. | Pleasant Hill | 1,266 |
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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.
