Union County | |
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![]() Union County Courthouse | |
![]() Location within the U.S. state of Ohio | |
![]() Ohio's location within the U.S. | |
Coordinates: 40°19′N 83°22′W / 40.31°N 83.37°W | |
Country | ![]() |
State | ![]() |
Founded | April 1, 1820[1] |
Named for | formed from the union of parts of surrounding counties |
Seat | Marysville |
Largest city | Marysville |
Area | |
• Total | 437 sq mi (1,130 km2) |
• Land | 432 sq mi (1,120 km2) |
• Water | 5.1 sq mi (13 km2) 1.2% |
Population (2020) | |
• Total | 62,784 |
• Density | 140/sq mi (55/km2) |
Time zone | UTC−5 (Eastern) |
• Summer (DST) | UTC−4 (EDT) |
Congressional district | 4th |
Website | www |
Union County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 62,784.[2] Its county seat is Marysville.[3] Its name is reflective of its origins, it being the union of portions of Franklin, Delaware, Madison, and Logan counties.[4]
Union County is part of the Columbus, OH Metropolitan Statistical Area.