Complete List of Online Data Sets
- County Boundaries
- Illinois State Boundary
- Illinois Illinois Public Land Survey System (PLSS) Boundaries
- Illinois PLSS Townships
- Indian Treaty Boundary Lines
- State Plane Zones
- Universal Transverse Mercator (UTM) Zones
- USGS Quadrangle Boundaries and Corner Points in Illinois
- Archaeological Resource Potential
- U.S. Geographic Names Information System (GNIS) for Illinois
- Municipal Boundaries: Incorporated Places 2000
- Political Districts and Boundaries, 2006 and 2007
- Political Townships
- Roads from 1:100,000-scale Digial Line Graphs (1980- 1986)
- Bedrock Geology
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- Bedrock Geology
- Bedrock Topography
- Bedrock Valleys
- Structural Geology
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- Anticlines, Synclines, and Monoclines
- Faults, Grabens, and Flexures
- Structural Features: Polygon and Point Features
- Surficial Geology
- Glacial Boundaries
- Driftless Areas
- Glacial Drift Thickness and Character
- Moraines (End Moraines) of the Wisconsin Episode
- Physiographic Divisions
- Quaternary Deposits, 1979
- Quaternary Deposits, 1996
- Soil Associations Map (500K)
- Stack-Unit Mapping of Geologic Materials to a Depth of 15 meters
- Surface Elevation
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- 30-Meter Digital Elevation Model (DEM)
- 30-Meter Shaded Relief Map
- 301-Foot Digital Elevation Model (DEM)
- 301-Foot Shaded Relief Map
- Major Aquifers
- Flood Zones for Unincorporated Areas, One-Hundred and Five-Hundred Year
- Potential of Agricultural Chemical Contamination of Aquifers
- Sinkhole Areas (an indicator of karst terrain)
- Streams and Shorelines
- Wetlands, National Wetlands Inventory, 1987
- Basic IGQ Products
- Alton Surficial Geology
- Elburn Surficial Geology
- Elsah Surficial Geology
- Geneva Surficial Geology
- Grafton Surficial Geology
- Villa Grove Aquifer Sensitivity
- Villa Grove Bedrock Geology
- Villa Grove Bedrock Topography
- Villa Grove Drift Thickness
- Villa Grove Surficial Geology
USGS Topographic Maps for Illinois
- Digital Raster Graphic (DRG) Quadrangle files for Illinois
- Imagemap Index, 1:250,000 scale
- Imagemap Index, 1:100,000 scale
- Imagemap Index, 1:24,000 scale
Aerial Photography and Orthophotography
- 2005 Digital Orthophoto Quarter Quadrangles
- Download 2005 DOQ Data, SPE (text-based)
- Download 2005 DOQ Data, UTM (text-based)
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- 2005 Chicago Urban Area (CUA) Data
- Download 2005 CUA Data, SPE (text-based)
- Download 2005 CUA Data, UTM (text-based)
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- 1998-2001 Digital Orthophoto Quad (DOQ) data
- Download DOQs (text-based)
- Download DOQs (image map)
- Download DOQs (interactive map)
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- 2000 Orthophotography, Des Plaines River Watershed
- Download tiles (text-based)
- Download tiles (image map)
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- 1938-1941 Historical Aerial Photographs
- Download photos (text-based)
- Download photos (interactive map)