THE MERCER COUNTY LAND BRIEF
Land in the
Clayey High Lime Till Plains setting.
Mercer County has 462.4 square miles of land in Ohio. The mapped landscape region in Mercer County is Clayey High Lime Till Plains.
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
Finding your parcel within Mercer County
The atlas lists 24 cities, towns, townships, and Census communities associated with Mercer County, including Marion, Granville, Dublin. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Mercer County by land and water
The Census records 11 square miles of water within Mercer County, or 2.3% of its total area. That share is close to Mercer County’s 2.3%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Mercer County has 13.7 times the land area of nearby Jefferson township (33.7 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Auglaize County, Darke County, Shelby County, Van Wert County within Ohio. A tract near one of these lines should be matched to the county identifier on its own records.

