Resident Population in Hardin County, IA was 16.46300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Hardin County, IA reached a record high of 22.30000 in January of 1971 and a record low of 16.46300 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Hardin County, IA - last updated from the United States Federal Reserve on May of 2024.