Union County GIS Maps
Union County, Ohio, has 62,784 residents and covers 431.8 square miles. The population grew 20% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Union County is 39159.
Marysville is the county's largest population center. Union County also includes 8 zip codes, 7 public school districts and 31 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.
Union County Trends
- Population
- 62,784▴
- Median Home Value
- $306,600▴
- K-12 Enrollment
- 30,007▴
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.
Union 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.
Union County Population
Union County had 62,784 residents in 2020. That was 20% higher than in 2010. Union County added 21,875 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 145 people per square mile. Some of the county's most populated postal areas include Marysville, Richwood and West Mansfield.
Population Trend in Union County OH
Union County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Union County Zip Codes
Union County has 8 zip codes. Some of the county's most populated zip codes include Marysville (43040), Richwood (43344) and West Mansfield (43358). Marysville is the largest zip by population, with about 35,853 residents or 57% of the county total. Together, the three largest zips account for about 70% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Union County OH
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 43040 | Marysville | 35,853 | ▴ 12.8% |
| 43344 | Richwood | 5,702 | ▴ 0.4% |
| 43358 | West Mansfield | 2,587 | ▴ 2.6% |
| 43045 | Milford Center | 1,928 | ▾ -1.3% |
| 43067 | Raymond | 1,410 | ▾ -11.4% |
| Download all zip code data | |||
Union County Zip Code populations and trends per most recent census data.
Union County Demographics
Union County has a median age of 38.1, which makes the county a little younger than Ohio overall. About 24.3% of residents are under 18, while 12.9% 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 35.9% of the population, which points to a solid working-age base. About 39.1% 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 Union County OH
Median Age
38.1
Under 18
24.3%
Age 65+
12.9%
Bachelor's+
39.1%
Union County School Districts
Union County is served by 7 public school districts with 30,007 students enrolled in 2024. The largest districts on the county map are Dublin City, Marysville Exempted Village and Jonathan Alder Local. Those three districts account for about 84% 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 Union County OH
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Dublin City School District | 16,967 | 56.5% | ▴ 1.4% |
| Marysville Exempted Village School District | 5,781 | 19.3% | ▴ 1.3% |
| Jonathan Alder Local School District | 2,412 | 8% | ▴ 6.1% |
| Benjamin Logan Local School District | 1,591 | 5.3% | ▾ -3.3% |
| North Union Local School District | 1,364 | 4.5% | ▾ -1.7% |
| Download all school district data | |||
Union County school district enrollment and trends per most recent NCES reporting data.
Union County Housing & Real Estate
Union County has a median home value of $306,600 and a median gross rent of $1,188. About 79% 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 above the state average. In March 2026, the median listing price was $552,175 and homes spent about 49 days on the market.
Union County Housing Mix
Union County housing mix: owner, renter and vacant units.
Union County Housing Trends
Union County median home value and rent trend (last 5 years).
Businesses in Union County, OH
Union County has 2,306 business listings across 510 categories. The largest categories in Union County business listings are Churches & Religious Organizations (71, 3.1%), Real Estate Agents (47, 2.0%), and Farm (47, 2.0%). The full Union County business listings dataset includes names, categories, addresses and contact details where available. Union County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Union County, OH
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 71 | 3.1% |
| Real Estate Agents | 47 | 2.0% |
| Farm | 47 | 2.0% |
| Contractors | 44 | 1.9% |
| Auto Repair | 34 | 1.5% |
| Insurance Agencies | 33 | 1.4% |
| Professional Services | 32 | 1.4% |
| Medical Offices | 31 | 1.3% |
| Gas Stations | 30 | 1.3% |
| Landmark And Historical Building | 30 | 1.3% |
Union County Business Listings
| Business | Category | City |
|---|---|---|
| The Marysville Union | Abuse And Addiction Treatment | Marysville |
| Richwood Greene Senior Living | Accommodation | Richwood |
| Bingman Associates Inc. | Accountant | Marysville |
| Marysville Upground Reservoir | Active Life | Marysville |
| Tranquility Acupuncture, LLC | Acupuncture | Marysville |
| Celebrity | Advertising Agency | Marysville |
| Ag-Pro | Agricultural Service | Richwood |
| KG Agri Products | Agriculture | Marysville |
| Union County Airport | Airport | Marysville |
| Premier Allergy | Allergist | Marysville |
| Download Union County business listings | ||
Union County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Union County Basemaps
Union 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 Union County Data Package
This page shows a preview of what's included in the Union 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.
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Nearby Counties
Browse county data pages for the counties that border Union County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.