County Maps
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.
| Alexander | 2022 | Bedrock Geology |
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| Boone | 2000 | Bedrock Topography |
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| Boone, Winnebago | 2000 | Bedrock Geology |
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| Bureau | 2009 | Surficial Geology |
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| Carroll | 1997 | Bedrock Topography |
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| Carroll | 1997 | Surface Slopes |
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| Carroll | 1997 | Land Cover |
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| Carroll | 1997 | Aquifer Sensitivity |
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| Carroll | 1997 | Surficial GeologyQuaternary Deposits |
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| Carroll | 1997 | Shaded Relief |
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| Carroll | 1997 | Bedrock Geology |
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| Carroll | 1997 | Surface Topography |
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| Carroll | 1997 | Data Points |
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| Carroll | 1997 | Mineral Resources |
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| Champaign | 2014 | Surface Topography |
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| Cook | 2004 | Geologic Atlas |
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| DuPage | 2014 | Surface Topography |
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| Hardin | 2014 | Bedrock Geology |
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| Henry | 2011 | Surficial Geology |
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| Henry | 2012 | Surface Topography |
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| Jo Daviess | 2000 | Bedrock Topography |
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| Jo Daviess | 2017 | Karst Terrain |
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| Jo Daviess | 2000 | Surficial Geology |
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| Jo Daviess | 2000 | Quaternary Deposits |
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| Jo Daviess | 2000 | Bedrock Geology |
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| Jo Daviess | 2015 | Karst Terrain |
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| Jo Daviess | 2014 | Surface Topography |
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| Jo Daviess | 2000 | Surface Topography |
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| Jo Daviess | 2000 | Data Points |
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| Jo Daviess | 2000 | Aquifer Sensitivity |
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| Jo Daviess | 2000 | Shaded Relief |
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| Jo Daviess | 2000 | Land Cover |
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| Johnson | 2021 | Bedrock Geology |
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| Kane | 2014 | Surface Topography |
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| Kane | 2013 | Surficial Geology |
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| Kane | 2007 |
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| Kane | 2007 | Aquifer Sensitivity |
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| Kane | 2007 | Cross Sections |
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| Kane | 2007 | Three-dimensional Model |
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| Kane | 2007 | Bedrock Geology |
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| Lake | 2003 | Three-dimensional Model |
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| Lake | 2015 | Surficial Geology |
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| Lake | 2013 | Surface Topography |
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| Lee | 1999 | Bedrock Geology |
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| Lee | 1999 | Shaded Relief |
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| Lee | 1999 | Data Points |
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| Lee | 2014 | Surface Topography |
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| Lee | 1999 | Bedrock Topography |
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| Lee | 1999 | Surface Topography |
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| Lee | 1999 | Quaternary Deposits |
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| Lee | 2009 | Outwash Sand Deposits |
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| Madison | 2006; originally 2006 | Surficial Geology |
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| Madison | 2022 | Bedrock Topography |
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| Massac | 2022 | Bedrock Geology |
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| McHenry | 1995 | Surface Topography |
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| McHenry | 2021 | Surficial Geology |
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| McHenry | 2014 | Surface Topography |
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| McLean | 1997 | Drift ThicknessQuaternary Deposits |
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| McLean | 1997 | Data Points |
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| McLean | 1997 | Surface Topography |
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| McLean | 1997 | Bedrock Topography |
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| McLean | 1998 | Cumulative Sand and Gravel Thickness |
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| McLean | 1997 | Extraction Operations |
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| Monroe | 2012 | Sinkhole Distribution |
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| Monroe | 2014 | Surface Topography |
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| Monroe | 2021 | Surficial Geology |
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| Pope | 2016 | Bedrock Geology |
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| Pulaski | 2022 | Bedrock Geology |
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| St Clair | 2022 | Bedrock Topography |
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| St Clair | 2011; originally 2010 | Surficial Geology |
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| St Clair | 2014 | Surface Topography |
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| Tazewell | 2003 | Data Points |
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| Tazewell | 2003 | Bedrock Topography |
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| Tazewell | 2003 | Surficial Geology |
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| Tazewell | 2003 | Shaded Relief |
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| Tazewell | 2003 | Aquifer Sensitivity |
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| Tazewell | 2003 | Surface Topography |
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| Tazewell | 2003 | Drift ThicknessQuaternary Deposits |
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| Tazewell | 2003 | Extraction Operations |
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| Tazewell | 2003 | Surface Slopes |
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| Union | 2021 | Bedrock Geology |
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| Whiteside | 2014 | Surface Topography |
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| Whiteside | 2013 | Surficial Geology |
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| Will | 2014 | Surface Topography |
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| Williamson | 2020 | Surficial Geology |
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| Williamson | 2020 | Bedrock Geology |
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| Boone, Winnebago | 2000 | Bedrock Geology |
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