Resident Population in Coles County, IL was 46.42300 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Coles County, IL reached a record high of 53.86500 in January of 2010 and a record low of 46.42300 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Coles County, IL - last updated from the United States Federal Reserve on April of 2026.