Resident Population in Cass County, IN was 37.55900 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Cass County, IN reached a record high of 41.00000 in January of 1974 and a record low of 37.55900 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Cass County, IN - last updated from the United States Federal Reserve on April of 2026.