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, Winnebago | 2000 | Bedrock Geology |
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| Boone | 2000 | Bedrock Topography |
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| Bureau | 2009 | Surficial Geology |
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| Carroll | 1997 | Land Cover |
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| Carroll | 1997 | Surficial GeologyQuaternary Deposits |
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| Carroll | 1997 | Aquifer Sensitivity |
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| Carroll | 1997 | Shaded Relief |
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| Carroll | 1997 | Data Points |
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| Carroll | 1997 | Bedrock Geology |
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| Carroll | 1997 | Surface Topography |
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| Carroll | 1997 | Mineral Resources |
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| Carroll | 1997 | Bedrock Topography |
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| Carroll | 1997 | Surface Slopes |
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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 | 2012 | Surface Topography |
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| Henry | 2011 | Surficial Geology |
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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 | Shaded Relief |
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| Jo Daviess | 2000 | Aquifer Sensitivity |
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| Jo Daviess | 2000 | Land Cover |
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| Jo Daviess | 2000 | Bedrock Topography |
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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 | Surficial Geology |
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| Jo Daviess | 2000 | Quaternary Deposits |
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| Jo Daviess | 2017 | Karst Terrain |
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| Jo Daviess | 2000 | Bedrock Geology |
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| Johnson | 2021 | Bedrock Geology |
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| Kane | 2007 | Aquifer Sensitivity |
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| Kane | 2014 | Surface Topography |
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| Kane | 2007 | Cross Sections |
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| Kane | 2013 | Surficial Geology |
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| Kane | 2007 | Three-dimensional Model |
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| Kane | 2007 | Bedrock Geology |
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| Kane | 2007 |
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| Lake | 2015 | Surficial Geology |
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| Lake | 2013 | Surface Topography |
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| Lake | 2003 | Three-dimensional Model |
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| Lee | 1999 | Data Points |
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| Lee | 2009 | Outwash Sand Deposits |
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| Lee | 1999 | Surface Topography |
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| Lee | 1999 | Bedrock Topography |
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| Lee | 1999 | Shaded Relief |
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| Lee | 1999 | Quaternary Deposits |
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| Lee | 1999 | Bedrock Geology |
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| Lee | 2014 | Surface Topography |
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| Madison | 2022 | Bedrock Topography |
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| Madison | 2006; originally 2006 | Surficial Geology |
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| Massac | 2022 | Bedrock Geology |
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| McHenry | 2014 | Surface Topography |
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| McHenry | 1995 | Surface Topography |
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| McHenry | 2021 | Surficial Geology |
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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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| McLean | 1997 | Drift ThicknessQuaternary Deposits |
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| McLean | 1997 | Data Points |
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| Monroe | 2014 | Surface Topography |
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| Monroe | 2021 | Surficial Geology |
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| Monroe | 2012 | Sinkhole Distribution |
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| Pope | 2016 | Bedrock Geology |
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| Pulaski | 2022 | Bedrock Geology |
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| St Clair | 2011; originally 2010 | Surficial Geology |
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| St Clair | 2022 | Bedrock Topography |
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| St Clair | 2014 | Surface Topography |
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| Tazewell | 2003 | Extraction Operations |
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| Tazewell | 2003 | Surface Slopes |
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| Tazewell | 2003 | Data Points |
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| Tazewell | 2003 | Surficial Geology |
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| Tazewell | 2003 | Bedrock Topography |
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| Tazewell | 2003 | Shaded Relief |
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| Tazewell | 2003 | Surface Topography |
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| Tazewell | 2003 | Aquifer Sensitivity |
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| Tazewell | 2003 | Drift ThicknessQuaternary Deposits |
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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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