Resident Population in Sangamon County, IL was 193.49100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Sangamon County, IL reached a record high of 199.43100 in January of 2012 and a record low of 161.33500 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Sangamon County, IL - last updated from the United States Federal Reserve on May of 2024.