Resident Population in Jo Daviess County, IL was 21.75600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Jo Daviess County, IL reached a record high of 23.78600 in January of 1981 and a record low of 21.22400 in January of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Jo Daviess County, IL - last updated from the United States Federal Reserve on May of 2024.