Mercer County GIS Maps
Mercer County, Ohio, has 42,528 residents and covers 462.4 square miles. The population grew 4.2% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Mercer County is 39107.
Celina is the county's largest population center. Mercer County also includes 10 zip codes, 8 public school districts and 33 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers and sample data. Paid packages add full layers, analytics and database files.
Mercer County Trends
- Population
- 42,528▴
- Median Home Value
- $208,600▴
- K-12 Enrollment
- 10,089▴
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
Mercer County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
Mercer County Population
Mercer County had 42,528 residents in 2020. That was 4.2% higher than in 2010. Mercer County added 1,604 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 92 people per square mile. Some of the county's most populated postal areas include Celina, Coldwater and Fort Recovery.
Population Trend in Mercer County OH
Mercer County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Mercer County Zip Codes
Mercer County has 10 zip codes. Some of the county's most populated zip codes include Celina (45822), Coldwater (45828) and Fort Recovery (45846). Celina is the largest zip by population, with about 19,945 residents or 47% of the county total. Together, the three largest zips account for about 73% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Mercer County OH
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 45822 | Celina | 19,945 | ▴ 5.3% |
| 45828 | Coldwater | 6,495 | ▴ 6% |
| 45846 | Fort Recovery | 4,461 | ▴ 0.5% |
| 45883 | Saint Henry | 4,026 | ▴ 3.7% |
| 45882 | Rockford | 3,005 | ▴ 0% |
| Download all zip code data | |||
Mercer County Zip Code populations and trends per most recent census data.
Mercer County Demographics
Mercer County has a median age of 39.1, which makes the county a little younger than Ohio overall. About 26.2% of residents are under 18, while 18.6% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 28% of the population, which points to a solid working-age base. About 22.2% of adults have a bachelor's degree or higher, above the statewide figure of 30.9%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for Mercer County OH
Median Age
39.1
Under 18
26.2%
Age 65+
18.6%
Bachelor's+
22.2%
Mercer County School Districts
Mercer County is served by 8 public school districts with 10,089 students enrolled in 2024. The largest districts on the county map are Celina City, Coldwater Exempted Village and St. Henry Consolidated Local. Those three districts account for about 53% of public school enrollment in the map area. Total enrollment has grown modestly since 2017 across the districts shown on the county map.
Largest School Districts by Enrollment in Mercer County OH
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Celina City School District | 2,815 | 27.9% | ▾ -2% |
| Coldwater Exempted Village School District | 1,476 | 14.6% | ▴ 2.2% |
| St. Henry Consolidated Local School District | 1,085 | 10.8% | ▴ 3.5% |
| Marion Local School District | 1,016 | 10.1% | ▴ 6.7% |
| Fort Recovery Local School District | 997 | 9.9% | ▾ -2.2% |
| Download all school district data | |||
Mercer County school district enrollment and trends per most recent NCES reporting data.
Mercer County Housing & Real Estate
Mercer County has a median home value of $208,600 and a median gross rent of $812. About 80% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Ohio median, while rents come in below the state average. In March 2026, the median listing price was $299,450 and homes spent about 40 days on the market.
Mercer County Housing Mix
Mercer County housing mix: owner, renter and vacant units.
Mercer County Housing Trends
Mercer County median home value and rent trend (last 5 years).
Businesses in Mercer County, OH
Mercer County has 1,752 business listings across 432 categories. The largest categories in Mercer County business listings are Churches & Religious Organizations (56, 3.2%), Contractors (40, 2.3%), and Auto Repair (33, 1.9%). The full Mercer County business listings dataset includes names, categories, addresses and contact details where available. Mercer County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Mercer County, OH
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 56 | 3.2% |
| Contractors | 40 | 2.3% |
| Auto Repair | 33 | 1.9% |
| Gas Stations | 32 | 1.8% |
| Beauty Salons | 26 | 1.5% |
| Medical Offices | 20 | 1.1% |
| Insurance Agencies | 20 | 1.1% |
| Parks & Recreation | 19 | 1.1% |
| Public And Government Association | 19 | 1.1% |
| Banks & Credit Unions | 17 | 1.0% |
Mercer County Business Listings
| Business | Category | City |
|---|---|---|
| Moorman Harting and Co | Accountant | Coldwater |
| Mendon Ball Park | Active Life | Mendon |
| Brand It Marketing Communications | Advertising Agency | Rockford |
| Mercer Landmark | Agricultural Cooperatives | Coldwater |
| Maria Stein Grain | Agricultural Service | Maria Stein |
| Unique Roots Inc. | Celina OH | Agriculture | Celina |
| ProClean Systems | Air Duct Cleaning Service | Celina |
| Lakefield Airport | Airport | Celina |
| Hirschfeld Construction LLC | Altering And Remodeling Contractor | Celina |
| CJ's HighMarks | American Restaurants | Celina |
| Download Mercer County business listings | ||
Mercer County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Mercer County Basemaps
Mercer County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.
Get the Full Mercer County Data Package
This page shows a preview of what's included in the Mercer County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
One-time · instant download · 30-day refund guarantee · See full package details
Preview a Live Package Demo
See exactly what is included in a county data package. Inspect how files are organized, the interactive data explorer and how maps and analytics are laid out. The demo loads a real sample package from Ohio — explore the full structure before you buy.
No email or download required. Opens in a preview window on this page.
Nearby Counties
Browse county data pages for the counties that border Mercer County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.