Resident Population in Adams County, IA was 3.54400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Adams County, IA reached a record high of 6.32200 in January of 1970 and a record low of 3.54400 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Adams County, IA - last updated from the United States Federal Reserve on May of 2024.