This image is a derivative work of the following images: File:Illinois_Locator_Map.PNG licensed with Cc-by-sa-2.5, Cc-by-sa-3.0-migrated, GFDL, PD-USGov-DOC-Census...
png Illinois counties 1821.png Illinois counties 1823.png Illinois counties 1824.png Illinois counties 1825.png Illinois counties 1826.png Illinois counties...