Mercer   County OH United States

County FIPS 39107
Largest City Celina
State Ohio
Latitude 40.5400
Longitude -84.6294
Population 42,484
Density 91.89 people per square mile
Time Zone America/New York
  • All demographic data comes from the 2024 American Community Survey (5-year study).
  • Learn more about each field.
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Household Income

Median household: $76,782
Median individual: $40,526

Race

Mode: 94.9% White

Gender

 50.7% male 

Rent

  $804 / month  

Median house value: $209,269.0

Age

Median: 39.4 years old

Education

With at least college degree: 21.9%
With STEM degree: 41.7%

Marital Status

 56.3% married 

Never married: 27.7%

Labor Force Participation

 67.0% working 

Unemployed: 1.6%

Average Family Size

 3.13 people 

Commute Time

 18.5 minutes 

Health Care

 3.6% uninsured 

Poverty

 7.3%

All data comes from the SimpleMaps US Counties Database, 2026.

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