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Carroll County Courthouse in Carrollton. Carroll County is a county located in the U.S. state of Missouri. As of the 2010 census, the county had a population of 9,295. Its county seat is Carrollton. The county was organized on January 2, 1833 from part of Ray County, Missouri and named for Charles Carroll of Carrollton, a signer of the Declaration of Independence. 1 Geography.