Resident Population in Livingston County, IL was 35.32000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Livingston County, IL reached a record high of 42.00000 in January of 1978 and a record low of 35.32000 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Livingston County, IL - last updated from the United States Federal Reserve on May of 2024.