Resident Population in Franklin County, IA was 9.87500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Franklin County, IA reached a record high of 13.25500 in January of 1970 and a record low of 9.87500 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Franklin County, IA - last updated from the United States Federal Reserve on May of 2024.