| Union County, AR (County) |
| Union County, IL (County) |
| Union County, OR (County) |
| Union County, GA (County) |
| Union County, IN (County) |
| Union Dale, PA (Borough) |
| Union Gap, WA (City) |
| Union Grove, TX (City) |
| Union Grove, MN (Township) |
| Union Grove, AL (Town) |
| Union Grove Township, IL (Township) |
| Union Grove Village, WI (Village) |
| Union Hill, IL (Village) |
| Union Parish, LA (County) |
| Union Park Community Development District, FL (CDD) |
