De Kalb County, IN - Resident Population in DeKalb County, IN was 44.19800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, De Kalb County, IN - Resident Population in DeKalb County, IN reached a record high of 44.19800 in January of 2023 and a record low of 30.83700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for De Kalb County, IN - Resident Population in DeKalb County, IN - last updated from the United States Federal Reserve on May of 2024.