- Union County (Arkansas)
- Union County (Florida)
- Union County (Georgia)
- Union County (Illinois)
- Union County (Indiana)
- Union County (Iowa)
- Union County (Kentucky)
- Union County (Mississippi)
- Union County (New Jersey)
- Union County (New Mexico)
- Union County (North Carolina)
- Union County (Ohio)
- Union County (Oregon)
- Union County (Pennsylvania)
- Union County (South Carolina)
- Union County (South Dakota)
- Union County (Tennessee)
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