This is a list of U.S. counties named after other U.S. counties.
- Champaign County, Illinois: Champaign is named for Champaign County, Ohio.
- Christian County, Illinois: Christian is named for Christian County, Kentucky.
- Hardin County, Illinois: Hardin is named for Hardin County, Kentucky.
- Henderson County, Illinois: Henderson is named for Henderson County, Kentucky.
- Lancaster County, South Carolina: Lancaster is named for Lancaster County, Pennsylvania.
- Lincoln County, South Dakota: Lincoln is named for Lincoln County, Maine.
- Mason County, Illinois: Mason is named for Mason County, Kentucky.
- Orange County, Indiana: Orange is named for Orange County, North Carolina.
- Richland County, Illinois: Richland is named for Richland County, Ohio.
- Williamson County, Illinois: Williamson is named for Williamson County, Tennessee.
- Woodford County, Illinois: Woodford is named for Woodford County, Kentucky.
- York County, South Carolina: York is named for York County, Pennsylvania.
Possibly
- Delaware County, Iowa: Delaware is named for either the state of Delaware or Delaware County, New York.
- Louisa County, Iowa: Louisa is named for either Louisa Massey of Dubuque, Iowa, who, according to legend, killed the murderer of her brother; or Louisa County, Virginia.
- Randolph County, Indiana: Randolph is named for either Thomas Randolph or Randolph County, North Carolina.
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