Seneca County, Ohio
Located in Ohio, Seneca County has a population of 54,770 residents and a median age of 40.2 years, making it the #950 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 11.9%. The median home value is $154,700, and the median household income is $66,025, which is 12% below the national median.
Demographics
Seneca County has a population of 54,770, making it the #950 most populous county in the US. The median age is 40.2 years, which is 3.3% 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 Seneca County is $66,025, ranking #1,539 out of 3,222 counties — 12.1% below the national median. The poverty rate is 11.9% and unemployment stands at 3.6%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Seneca County is $154,700 (-45.1% vs national). Renters pay a median of $856/mo and the homeownership rate is 73.4%.
Median Home Value Trend
Rankings →Household Type
Education
In Seneca County, 20.6% of adults age 25+ hold a bachelor's degree or higher, which is 38.9% below the national average, ranking #1,896 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Seneca County is 74.8 years. 19.8% of adults report poor or fair health and 6.3% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
22.4% of adults in Seneca County smoke , 47.1% are obese , and 20.2% report excessive drinking. The drug overdose death rate is 40.1 per 100,000.
Adult Smoking Trend
Safety
The suicide rate is 18.4 per 100,000. Motor vehicle deaths occur at a rate of 10.6 per 100,000.
Suicide Rate Trend
Families & Children
17.1% of children in Seneca County live in poverty and the infant mortality rate is 7.2 per 1,000 live births. The teen birth rate is 17.6 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Seneca County is 60.6%. The mean commute time is 22.8 min, which is 17.4% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Seneca County voted Republican with a margin of 37.5%. The vote was 30.7% Dem / 68.2% Rep. Compared to 2020, the margin shifted 3.3 toward Republicans .
Vote Share Over Time
About Seneca County, Ohio
Seneca County, Ohio has a total population of 54,770, making it the 950th most populous county in the United States. The median age in Seneca County is 40.2 years, which is 3.3% above the national median of 38.9 years.
The median household income in Seneca County is $66,025, which ranks #1,539 of 3,222 counties nationwide. This is 12.1% below the national median of $75,149. The poverty rate is 11.9%, lower than the national rate of 12.6%. The unemployment rate stands at 3.6%.
The median home value in Seneca County is $154,700, 45.1% below the national median. Renters in Seneca County pay a median gross rent of $856 per month. The homeownership rate is 73.4%, compared to the national rate of 64.4%.
In Seneca County, 20.6% of residents aged 25 and older hold a bachelor's degree or higher, 38.9% below the national average of 33.7%. Health insurance coverage stands at 94.7% of the population. The average commute time for workers is 22.8 min.
Seneca County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 87.8% of the population, followed by Hispanic or Latino (5.7%) and Two or More Races (3.0%).
All data for Seneca 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.