- Clay County (Alabama)
- Clay County (Arkansas) (originally Clayton County)
- Clay County (Florida)
- Clay County (Georgia)
- Clay County (Illinois)
- Clay County (Indiana)
- Clay County (Iowa)
- Clay County (Kansas)
- Clay County (Kentucky)
- Clay County (Minnesota)
- Clay County (Mississippi)
- Clay County (Missouri)
- Clay County (Nebraska)
- Clay County (North Carolina)
- Clay County (South Dakota)
- Clay County (Tennessee)
- Clay County (Texas)
- Clay County (West Virginia)
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