Resident Population in Lenawee County, MI was 97.74600 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Lenawee County, MI reached a record high of 101.33600 in January of 2006 and a record low of 81.95100 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Lenawee County, MI - last updated from the United States Federal Reserve on April of 2026.