Resident Population in Boone County, IA was 26.59000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Boone County, IA reached a record high of 27.50000 in January of 1972 and a record low of 25.10900 in January of 1989. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Boone County, IA - last updated from the United States Federal Reserve on May of 2024.