THE UNION COUNTY LAND BRIEF
Land in the
Clayey High Lime Till Plains setting.
Union County has 431.7 square miles of land in Ohio. 4 mapped landscape regions meet across Union County: Clayey High Lime Till Plains, Darby Plains, Loamy High Lime Till Plains, among others.
Rolling glacial till plains are interrupted by end moraines and areas of older, more dissected deposits. The historical landscape had more tree cover than the Central Corn Belt to the west.
Regional context: Eastern Corn Belt Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Union County intersects 4 mapped regional units. The largest mapped shares are:
- Clayey High Lime Till Plains87.7%
- Darby Plains9.8%
- Loamy High Lime Till Plains2.2%
- Mad River Interlobate Area0.3%
Finding your parcel within Union County
The atlas lists 23 cities, towns, townships, and Census communities associated with Union County, including Paris, York, Liberty. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Union County by land and water
The Census records 5.18 square miles of water within Union County, or 1.2% of its total area. That share is close to Union County’s 1.2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Union County has 16.4 times the land area of nearby Taylor township (26.3 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Champaign County, Delaware County, Franklin County, Hardin County, Logan County, Madison County, Marion County within Ohio. A tract near one of these lines should be matched to the county identifier on its own records.

