Clay County is the name of 18 counties in the United States. Most are named for Henry Clay, U.S. Senator and statesman:

• Clay County, Alabama
• Clay County, Arkansas (named for John Clayton, and originally named Clayton County)
• Clay County, Florida
• Clay County, Georgia
• Clay County, Illinois
• Clay County, Indiana
• Clay County, Iowa (named for Henry Clay Jr., son of Henry Clay and a soldier in the Mexican–American War)
• Clay County, Kansas
• Clay County, Kentucky (named for Green Clay, cousin of Henry Clay, a member of the Kentucky state legislature)
• 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

This disambiguation page lists articles about distinct geographical locations with the same name.
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