Population
42,737
2025
+0.5% since 2020
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. Resident population, July 1 estimate.
Mercer County, OH: population growth, jobs and income
Mercer County gained 217 residents between 2024 and 2025 (+0.5%).
Mercer County had an estimated 42,737 residents in 2025, up 0.5% (203 more people) since 2020. That is slower than Ohio as a whole (+0.9%), and the 30th fastest growth of 88 counties in Ohio.
Data as of 2025 · updated
14-day full refund · Stripe, Apple Pay or Google Pay · Instant PDF + CSV · Sold by Simply Stats LLC (NC)
How we compute every number · Refund terms
In the Mercer County report
One-time $99 PDF: everything on this page for Mercer County, ranked against Ohio and the U.S., plus these figures that are not on the free page:
- Median gross rent$804/mo2020–24
- Vacant homes, incl. seasonal and second homes9.4%2020–24
- New homes permitted, last 12 months972025-10/2026-09
- Rent growth, 5 yearsIn the report
- Permits in 5+ unit buildingsIn the report
- IRS income moving in (net AGI)In the report
- Neighbouring-county comparison tableIn the report
What's inside: 5 pages
- 1 Summary, headline numbers and ranks (free preview)
- 2 Ranks and the neighbouring-county table
- 3 Migration, with IRS mover and income flows
- 4 Rent, vacant homes, permits and employers
- 5 Every source and the methods
Headline numbers
Net domestic migration
−40
2025
−0.9 per 1,000 residents
−865 in total, 2021–2025
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. People moving in from other U.S. counties minus people moving out.
Unemployment rate
3.4%
2025
+0.6 pts since 2019
Source: U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics, 2025. Annual average unemployment rate.
New homes permitted
83
2025
−2.4% since 2021
1.9 per 1,000 residents
Source: U.S. Census Bureau, Building Permits Survey, 2025. Housing units authorized by building permits in the year.
Median household income
$76,782
2020–24
+17.1% since 2016–20
Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–24. American Community Survey 5-year estimate.
Private-sector employment
17,679
2023
+6.5% since 2018
Source: U.S. Census Bureau, County Business Patterns, 2023. Paid employees of private employers in mid-March (County Business Patterns).
What the numbers say
Net domestic migration was negative in 2025: 40 more people moved out to other U.S. counties than moved in.
Private employers had 17,679 paid employees in mid-March 2023, +6.5% since 2018 (County Business Patterns).
Unemployment averaged 3.4% in 2025, 0.6 points higher than in 2019 (before the pandemic).
Builders were authorized to start 83 new homes in 2025, or 1.9 per 1,000 residents.
Median household income was $76,782 in the 2020–24 American Community Survey, +17.1% since 2016–20.
Across the 3,107 U.S. counties with a comparable estimate, its population growth ranks 1,717th.
Part of the Celina, OH micro area.
Get Mercer County’s next numbers by email
Email me when Mercer County gets new Census numbers: population, building permits, jobs and income. About 4 emails a year, one click to stop.
Mercer County population by year
| Year | Population | Change |
|---|---|---|
| 2025 | 42,737 | +217 |
| 2024 | 42,520 | +160 |
| 2023 | 42,360 | +17 |
| 2022 | 42,343 | −23 |
| 2021 | 42,366 | −168 |
| 2020 | 42,534 | – |
Census Bureau population estimates, July 1 of each year.
What drove the change in Mercer County
Mercer County grew by 203 people since 2020 even though 865 more residents moved to other U.S. counties than came from them: births outnumbered deaths by 881, and net international migration added 195.
| Component | 2025 | 2020–25 | Share |
|---|---|---|---|
| Natural changebirths minus deaths | +203 | +881 | |
| International migrationfrom and to other countries | +52 | +195 | |
| Domestic migrationfrom and to other U.S. counties | −40 | −865 | |
| Census adjustmentbalancing residual | +2 | −8 | |
| Total change | +217 | +203 |
Census Bureau population estimates, components of change, each year July 1 to June 30. The components add up to the change in the estimate; the Census adjustment is the small balancing figure the Bureau publishes.
How it ranks
| Measure | In Ohio | Among U.S. counties |
|---|---|---|
| Population growth | 30th of 88 | 1,717th of 3,107 |
| Net domestic migration per 1,000 residents | 72nd of 88 | 2,073rd of 3,108 |
| Private-sector job growth | 21st of 88 | 1,037th of 3,092 |
| Median household income | 17th of 88 | 732nd of 3,107 |
| Lowest unemployment rate | 2nd of 88 | 835th of 3,108 |
| New homes permitted per 1,000 residents | 32nd of 88 | 1,564th of 3,005 |
1st = highest (lowest for unemployment). Counties are ranked only against others with a figure for the same period.
Get the county report — $99
The County Growth and Demographics Report for Mercer County, OH as a PDF, from federal data: population and migration, housing and rents, permits, private employers and jobs, unemployment, ranks in the state and the country, and neighbouring counties, with a source next to every number. Pay once, no subscription.
Add 2 neighbouring counties for $50: the Darke County and Shelby County reports too, $149 for all 3.
Preview page 1 of the Mercer County report (free, PDF) · See a full 5-page sample (PDF) · Other counties and options
Every purchase also includes a CSV of every table in the report, ready for a spreadsheet.
- Not useful? Email us within 14 days for a full refund
- Sold by Simply Stats LLC (NC)
- Secure Stripe checkout (Apple Pay/Google Pay)
- Instant PDF download
- PDF + CSV of every table
Refund terms: Terms. · How we compute every number
Neighbouring counties
Over 2020–25, Mercer County's population change (+0.5%) was ahead of 5 of its 6 neighbouring counties and behind 1 (Adams County, IN).
Only Auglaize County had a higher median household income (2020–24) among its 6 neighbouring counties; Mercer County's was $76,782.
| County | Population2025 | Population change2020–25 | Net domestic migration per 1,000 residents2025 | Homes permitted per 1,000 residents2025 | Median household income2020–24 |
|---|---|---|---|---|---|
| Mercer County, OH This county | 42,737 | +0.5% | −0.9 | 1.9 | $76,782 |
| Van Wert County, OH | 29,013 | +0.3% | 2.2 | 1.6 | $67,917 |
| Adams County, IN | 36,650 | +2.2% | −5.3 | 2.7 | $65,289 |
| Jay County, IN | 20,118 | −1.8% | −8.5 | 1.2 | $54,969 |
| Auglaize County, OH | 45,909 | −1.2% | −0.2 | 2.1 | $78,660 |
| Darke County, OH | 51,520 | −0.7% | 0.9 | 1.1 | $64,486 |
| Shelby County, OH | 48,065 | −0.2% | −0.7 | 6.4 | $73,978 |
Census Bureau population estimates and building permits, American Community Survey 5-year income. Rates per 1,000 residents. – means no figure, or a base too small for a change or rate (it would swing on a few people). A figure from another period shows its year and is left out of the comparison.
Questions
Is Mercer County growing?
Yes. Its population grew 0.5% between 2020 and 2025, about 203 more people (Census Bureau population estimates). Ohio as a whole changed +0.9% over the same years. That ranks 30th of 88 counties in Ohio for population growth.
How many people moved to Mercer County?
On net, none in 2025: about 40 more people moved out to other U.S. counties than moved in (Census Bureau net domestic migration estimate).
What is the unemployment rate in Mercer County?
It averaged 3.4% in 2025 (BLS Local Area Unemployment Statistics, annual average).
What is the population of Mercer County?
About 42,737 people, according to the U.S. Census Bureau's population estimate for July 1, 2025.
How many jobs are in Mercer County?
Private employers there had 17,679 paid employees in mid-March 2023, +6.5% since 2018 (Census Bureau County Business Patterns; government jobs and the self-employed are not counted).
What Beacon CRE covers in Ohio
Map, parcel and listing layers cover North and South Carolina only for now. This page and the other Ohio county pages carry the public federal growth figures.
Mercer County data alerts
Email me when Mercer County gets new Census numbers: population, building permits, jobs and income. About 4 emails a year, one click to stop.
Sources and method
- U.S. Census Bureau, Population Estimates Program (Vintage 2025)
- U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics
- U.S. Census Bureau, Building Permits Survey
- U.S. Census Bureau, American Community Survey 5-year estimates
- U.S. Census Bureau, County Business Patterns
Each number shows its own period. Changes compare the latest period with five years earlier (or the earliest period available). Beacon CRE last refreshed these figures on 2026-11-05. Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how we compute every number. More on every layer: data sources and licences.
Jobs outside North and South Carolina use County Business Patterns (paid private-sector employees in mid-March); wages and government jobs are not included.