Resident Population in Vermilion County, IL was 71.65200 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Vermilion County, IL reached a record high of 98.20000 in January of 1976 and a record low of 71.65200 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Vermilion County, IL - last updated from the United States Federal Reserve on May of 2024.