County Maps

Map of Illinois showing counties that have been mapped.

County mapping is carried out at the ISGS under a variety of programs. The programs exist for different purposes and require different levels of scientific review. Maps are published in specific Series based on the program under which they were created and the corresponding level of review. The links on this page access all downloadable county-scale maps except Coal, Oil, and Gas, which are maintained separately. Please use the Coal Maps and Oil and Gas Maps links to access those maps.

The ISGS Library page provides links to catalogs of ISGS maps and publications.

Lee Surface Topography 1999 Lee County Surface Topography
Madison Surficial Geology ... Madison County Surficial Map
McHenry Bedrock Topography 1995 McHenry County Bedrock Map
McLean Cumulative Sand and Gravel Thickness 1998 McLean County Thickness
McLean Bedrock Topography 1997 McLean County Bedrock Map
McLean Data Points 1997 McLean county Data Points
McLean Extraction Operations 1997 McLean County Extraction map
McLean Surface Topography 1997 McLean County Surface Topography
McLean Drift ThicknessQuaternary Deposits 1997 McLean County Thickness
Monroe Sinkhole Distribution 2012 Monroe County Sinkhole Map


Purchase this map online through Shop ISGS*, or contact the Sales and Information Office for more information.

*excludes EDMAP Series