Union County | |
|---|---|
 Union County Courthouse | |
 Flag  Seal | |
 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 |  United States |
| State |  Ohio |
| 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 (50/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, being the union of portions of Franklin, Delaware, Madison, and Logan counties.[4] Union County is part of the Columbus, Ohio Metropolitan Statistical Area.
- ^ "Ohio County Profiles: Union County" (PDF). Ohio Department of Development. Archived from the original (PDF) on May 8, 2007. Retrieved April 28, 2007.
- ^ 2020 census
- ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
- ^ "Union County data". Ohio State University Extension Data Center. Archived from the original on December 20, 2016. Retrieved April 28, 2007.