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.
| Boone | 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 | Surficial GeologyQuaternary Deposits |
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| Carroll | 1997 | Land Cover |
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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 | 2014 | Surface Topography |
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| Jo Daviess | 2000 | Data Points |
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| Jo Daviess | 2015 | Karst Terrain |
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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 | 2017 | Karst Terrain |
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| Jo Daviess | 2000 | Bedrock 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 | 2000 | Bedrock Geology |
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| Johnson | 2021 | Bedrock Geology |
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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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| Kane | 2014 | Surface Topography |
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| Kane | 2013 | Surficial Geology |
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| Kane | 2007 |
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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 | Data Points |
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| Lee | 1999 | Surface Topography |
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| Lee | 1999 | Shaded Relief |
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| Lee | 2014 | Surface Topography |
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| Lee | 1999 | Bedrock Topography |
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| Lee | 2009 | Outwash Sand Deposits |
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| Lee | 1999 | Quaternary Deposits |
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| Lee | 1999 | Bedrock Geology |
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| Madison | 2006; originally 2006 | Surficial Geology |
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| McHenry | 2014 | Surface Topography |
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| McHenry | 2021 | Surficial Geology |
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| McHenry | 1995 | Surface Topography |
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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 | 2021 | Surficial Geology |
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| Monroe | 2014 | Surface Topography |
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| Monroe | 2012 | Sinkhole Distribution |
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| Pope | 2016 | Bedrock Geology |
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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 | Shaded Relief |
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| Tazewell | 2003 | Data Points |
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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 | Bedrock Topography |
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| Tazewell | 2003 | Surface Slopes |
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| Tazewell | 2003 | Surficial Geology |
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| Tazewell | 2003 | Aquifer Sensitivity |
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| Union | 2021 | Bedrock Geology |
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| Whiteside | 2013 | Surficial Geology |
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| Whiteside | 2014 | Surface Topography |
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| Will | 2014 | Surface Topography |
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| Williamson | 2020 | Bedrock Geology |
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| Williamson | 2020 | Surficial Geology |
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