New Private Housing Structures Authorized by Building Permits for Williamson County, IL was 146.00000 Units in January of 2022, according to the United States Federal Reserve. Historically, New Private Housing Structures Authorized by Building Permits for Williamson County, IL reached a record high of 349.00000 in January of 2004 and a record low of 93.00000 in January of 2021. Trading Economics provides the current actual value, an historical data chart and related indicators for New Private Housing Structures Authorized by Building Permits for Williamson County, IL - last updated from the United States Federal Reserve on May of 2024.