Carroll is a city in, and the county seat of, Carroll County, Iowa, United States, along the Middle Raccoon River. The population was 10,321 i…Carroll is a city in, and the county seat of, Carroll County, Iowa, United States, along the Middle Raccoon River. The population was 10,321 in the 2020 census. Carroll was laid out in 1867. It took its name from Carroll County, which was named in honor of Charles Carroll of Carrollton, Maryland. He was the only Roman Catholic to sign the Declaration of Independence.
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