Mercer County, Ohio Demographics 2026
Mercer County, Ohio has a population of 42,438, the 57th most populous county in Ohio. The median household income is $78,036 and the median home value is $208,600. The poverty rate is 6.1%.
Mercer County Quick Facts
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 40 | National average: 61
Education
Educational Attainment (Adults 25+)
Cities & Places in Mercer County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Celina | 11,017 | $66,142 | 10.7% | $158,800 |
| Coldwater | 4,387 | $77,730 | 2.1% | $215,700 |
| St. Henry | 2,812 | $113,629 | 2.5% | $273,100 |
| Fort Recovery | 1,863 | $66,833 | 2.3% | $162,000 |
| Maria Stein | 1,065 | $86,923 | 0.0% | $337,000 |
| Rockford | 893 | $56,625 | 11.7% | $120,400 |
| Mendon | 600 | $59,583 | 6.1% | $100,400 |
| Chickasaw | 419 | $99,583 | 0.9% | $275,000 |
| Montezuma | 100 | $73,750 | 3.0% | $112,500 |
Explore Ohio Rankings
Population Overview
Mercer County is located in Ohio with a total population of 42,438. It is the 57th most populous county out of 88 in Ohio. The county encompasses 9 Census-designated places.
Age Demographics
The median age in Mercer County is 39.1 years. This is 1% lower than the state median of 39.6 years.
Economy, Income & Housing
The median household income in Mercer County is $78,036. This is 12% higher than the state median of $69,680. It is also about the same as the national median of $78,538. The poverty rate stands at 6.1%. This is 54% lower than the state poverty rate of 13.2%. The unemployment rate is 1.8%. This is 63% lower than the state rate of 4.9%. The median home value is $208,600. Housing costs are 5% higher than the state median of $199,200. With a home-value-to-income ratio of just 2.7x, Mercer County is one of the most affordable housing markets in the area. 79.7% of occupied housing units are owner-occupied. This homeownership rate is 19% higher than the state average of 67.0%.
Race & Ethnicity
Mercer County has a predominantly White (non-Hispanic) population, comprising 94.4% of all residents. Hispanic or Latino residents account for 2.2%. The Black or African American population (0.6%) is well below the state average of 12.1%. The Hispanic or Latino population (2.2%) is well below the state average of 4.6%. The Asian population (0.5%) is well below the state average of 2.4%.
Education
22.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 28% lower than the state rate of 30.9%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 94.7%.
Data Sources & Methodology
All figures for Mercer County come from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023), with comparisons drawn against Ohio and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.
Frequently Asked Questions
What is the population of Mercer County, Ohio?
Mercer County has a population of 42,438, making it the 57th most populous county in Ohio.
What is the median income in Mercer County?
The median household income in Mercer County is $78,036 with a poverty rate of 6.1%.
How many cities are in Mercer County, Ohio?
Mercer County contains 9 Census-designated places.