Resident Population in Macon County, IL was 100.73700 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Macon County, IL reached a record high of 132.40000 in January of 1978 and a record low of 100.73700 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Macon County, IL - last updated from the United States Federal Reserve on April of 2026.