Ohio County Maps
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Union County, Ohio
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Union County, Ohio Map
A detailed map of Union County. Click on a nearby County to view more information about that County. County boundaries are from the U.S. Census Bureau's 2025 TIGER/Line files.
Map of Townships in Union County, Ohio
An interactive map of county subdivisions in Union County. In Ohio, that can include Townships and Villages. Boundaries are from the U.S. Census Bureau's 2024 TIGER/Line files. Find what township you are in now.
Map of Counties in Ohio
An interactive map of Counties in Ohio. Click on a County to view more information about that County. County boundaries are from the U.S. Census Bureau's 2025 TIGER/Line files.
About Union County, Ohio
Union County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 62,784. Its county seat is Marysville. Its name is reflective of its origins, being the union of portions of Franklin, Delaware, Madison, and Logan counties. Union County is part of the Columbus, Ohio Metropolitan Statistical Area.
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This site has an interactive map of Ohio Counties. Click on the map to find your Ohio county, and view more details. You can also search for your address and use your GPS to find your Ohio County.
Find what County you are in, and see official Ohio County resources and information. Find any county in the United States, along with resources and links to official County websites. See a County map and local details. Looking for what county you are currently in? Find out on this map or use your device GPS to see what county you are in.
Snow Totals in Union County, Ohio
See recent snowfall, snow depth, and records for each city and town in Union County, Ohio.
About this data
- State and county boundaries
- TIGER/Line Shapefiles: States, Counties and ZIP Code Tabulation Areas (2025), U.S. Census Bureau. Boundaries of states, counties and ZIP codes. Updated
- County subdivision boundaries
- TIGER/Line Shapefiles: County Subdivisions and Places (2024), U.S. Census Bureau. Boundaries of towns, townships, cities and villages. Updated
- County list
- Cartographic Boundary Files: Counties (2024), U.S. Census Bureau. County names and extents, with Wikipedia links from Wikidata. Updated