Miami County, Ohio
Located in Ohio, Miami County has a population of 110,296 residents and a median age of 41.3 years, making it the #572 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 9.4%. The median home value is $229,100, and the median household income is $76,817, which is 2% above the national median.
Demographics
Miami County has a population of 110,296, making it the #572 most populous county in the US. The median age is 41.3 years, which is 6.2% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Miami County is $76,817, ranking #734 out of 3,222 counties — 2.2% above the national median. The poverty rate is 9.4% and unemployment stands at 3.1%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Miami County is $229,100 (-18.7% vs national). Renters pay a median of $966/mo and the homeownership rate is 73.4%.
Median Home Value Trend
Rankings →Household Type
Education
In Miami County, 26.8% of adults age 25+ hold a bachelor's degree or higher, which is 20.4% below the national average, ranking #1,028 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Miami County is 76.0 years. 15.3% of adults report poor or fair health and 5.9% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
16.4% of adults in Miami County smoke , 39.8% are obese , and 20.6% report excessive drinking. The drug overdose death rate is 26.0 per 100,000.
Adult Smoking Trend
Safety
The suicide rate is 13.1 per 100,000. Motor vehicle deaths occur at a rate of 11.6 per 100,000.
Suicide Rate Trend
Families & Children
11.4% of children in Miami County live in poverty and the infant mortality rate is 6.5 per 1,000 live births. The teen birth rate is 18.4 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Miami County is 71.9%. The mean commute time is 24.0 min, which is 13.1% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Miami County voted Republican with a margin of 45.1%. The vote was 27% Dem / 72.1% Rep. Compared to 2020, the margin shifted 0.7 toward Republicans .
Vote Share Over Time
About Miami County, Ohio
Miami County, Ohio has a total population of 110,296, making it the 572nd most populous county in the United States. The median age in Miami County is 41.3 years, which is 6.2% above the national median of 38.9 years.
The median household income in Miami County is $76,817, which ranks #734 of 3,222 counties nationwide. This is 2.2% above the national median of $75,149. The poverty rate is 9.4%, lower than the national rate of 12.6%. The unemployment rate stands at 3.1%.
The median home value in Miami County is $229,100, 18.7% below the national median. Renters in Miami County pay a median gross rent of $966 per month. The homeownership rate is 73.4%, compared to the national rate of 64.4%.
In Miami County, 26.8% of residents aged 25 and older hold a bachelor's degree or higher, 20.4% below the national average of 33.7%. Health insurance coverage stands at 95.3% of the population. The average commute time for workers is 24.0 min.
Miami County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 89.9% of the population, followed by Two or More Races (3.9%) and Hispanic or Latino (2.1%).
All data for Miami County, Ohio comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.