Union County on the map of Ohio 2024. Cities, roads, borders and directions in Union County of Ohio.

Union County is situated in the central area of Ohio. This wonderful county was named after Its formation by a union of four counties. The area of Union County is about 436.65 square miles. The county, founded on Apr 1, 1820 from Delaware, Franklin, Logan, and Madison Counties, and it is populated today by 65 thousand residents. Marysville is the county seat of Union County. This map shows the borders of Union County as well as neighboring counties, including major highways and natural objecsts as of 2024. Zoom in or out of the map using the plus/minus panel. Move the center of this map by dragging it. Also check out the satellite map of Union County.