Resident Population in Greene County, IA was 8.58400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Greene County, IA reached a record high of 12.71600 in January of 1970 and a record low of 8.58400 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Greene County, IA - last updated from the United States Federal Reserve on May of 2024.