Carrollton is a locality in eastern Carroll County, Maryland, United States. It is not to be confused with Carrollton Manor in Frederick County, from which Charles Carroll of Carrollton, a prominent signer of the Declaration of Independence, took his name. It also should not be confused with New Carrollton, Maryland, which is located in Prince George's County. Ne…Carrollton is a locality in eastern Carroll County, Maryland, United States. It is not to be confused with Carrollton Manor in Frederick County, from which Charles Carroll of Carrollton, a prominent signer of the Declaration of Independence, took his name. It also should not be confused with New Carrollton, Maryland, which is located in Prince George's County. New Carrollton, a Washington suburb created in the 1950s, was originally also called "Carrollton, Maryland," until the name was changed in 1966.