All-Transactions House Price Index for Mercer County, IL was 173.79000 Index 2000=100 in January of 2023, according to the United States Federal Reserve. Historically, All-Transactions House Price Index for Mercer County, IL reached a record high of 173.79000 in January of 2023 and a record low of 57.64000 in January of 1991. Trading Economics provides the current actual value, an historical data chart and related indicators for All-Transactions House Price Index for Mercer County, IL - last updated from the United States Federal Reserve on June of 2024.