Resident Population in Carroll County, IA was 20.52200 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Carroll County, IA reached a record high of 23.10000 in January of 1973 and a record low of 20.10100 in January of 2018. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Carroll County, IA - last updated from the United States Federal Reserve on May of 2024.