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.

Carroll Aquifer Sensitivity 1997
Carroll Data Points 1997 Carroll County Data Points
Carroll Quaternary Deposits 1997 Carroll county Surficial Map
Jo Daviess Aquifer Sensitivity 2000
Jo Daviess Data Points 2000 Jo Daviess Data Points
Kane Aquifer Sensitivity 2007 Kane County Aquifer Map
Lee Data Points 1999 Lee County Data Points
Lee Quaternary Deposits 1999 Lee County surficial map
McLean Data Points 1997 McLean county Data Points
Tazewell Aquifer Sensitivity 2003 Tazewell county Aquifer map