The 1940 Williamson County Plat Map with all twelve townships are contained in this gallery. The size was left large to allow for zooming into plat details. These maps are invaluable in determining property ownership and location for the year 1940.

For best results, use the download icon in the top right corner and you will be allowed to zoom in and out on details. This map set is ideal for use with the Illinois Ordnance Plant Property Acquisitions post.

(Note: These files were purposely left large to enable to zoom in on details, allow loading time.)