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 Topography |
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| Boone | 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 | 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 | Bedrock Geology |
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| Carroll | 1997 | Data Points |
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| Carroll | 1997 | Surface Topography |
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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 | Quaternary Deposits |
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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 | Bedrock Geology |
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| Jo Daviess | 2000 | Surface Topography |
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| Jo Daviess | 2017 | Karst Terrain |
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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 | 2000 | 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 | 2013 | Surficial Geology |
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| Kane | 2014 | Surface Topography |
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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 | Data Points |
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| Lee | 2014 | Surface Topography |
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| Lee | 1999 | Surface Topography |
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| Lee | 1999 | Shaded Relief |
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| Lee | 2009 | Outwash Sand Deposits |
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| Lee | 1999 | Bedrock Topography |
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| Lee | 1999 | Quaternary Deposits |
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| Madison | 2006; originally 2006 | Surficial Geology |
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| McHenry | 2014 | Surface Topography |
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| McHenry | 1995 | Surface Topography |
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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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| McLean | 1997 | Drift ThicknessQuaternary Deposits |
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| Monroe | 2012 | Sinkhole Distribution |
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| Monroe | 2014 | Surface Topography |
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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 | 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 | Data Points |
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| Tazewell | 2003 | Extraction Operations |
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| Tazewell | 2003 | Surface Slopes |
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| Tazewell | 2003 | Bedrock Topography |
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| Tazewell | 2003 | Surficial 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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