Carroll County is a county located in the northern part of the U.S. state of Kentucky. Its county seat is Carrollton. The county was formed in 1838 and named for Charles Carroll of Carrollton, the last living signer of the Declaration of Independence. It is located at the confluence of the Kentucky and Ohio Rivers.

Carrollton is a home rule-class city in—and the county seat of—Carroll County, Kentucky, United States, at the confluence of the Ohio and Kentucky rivers. The population was 3,938 at the 2010 census.