Resident Population in Montgomery County, IA was 10.13900 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Montgomery County, IA reached a record high of 13.60000 in January of 1977 and a record low of 9.91700 in January of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Montgomery County, IA - last updated from the United States Federal Reserve on May of 2024.