| Capital: | Marysville |
|---|---|
| Origen y Formación del condado: | Delaware, Franklin, Logan, and Madison Counties |
| Población: | 52,300 habitantes |
| Área: | 436 sq mi |
| Localización del condado dentro de Ohio: |
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Localidades en Union, Ohio
- Allen Township Union County
- Broadway
- Claibourne Township Union County
- Darby Township Union County
- Dover Township Union County
- Dublin
- Irwin
- Jackson Township Union County
- Jerome Township Union County
- Leesburg Township Union County
- Liberty Township Union County
- Magnetic Springs
- Marysville
- Milford Center
- Millcreek Township Union County
- New California
- Paris Township Union County
- Plain City
- Raymond
- Richwood
- Taylor Township Union County
- Unionville Center
- Union Township Union County
- Washington Township Union County
- York Township Union County