Complete List of Online Data Sets

Statewide 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

Statewide Data Sets

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
Statewide Data Sets

Bedrock Geology
Bedrock Geology
Bedrock Topography
Bedrock Valleys

Structural Geology
Anticlines, Synclines, and Monoclines
Faults, Grabens, and Flexures
Structural Features: Polygon and Point Features

Surficial Geology and Elevation
Statewide Data Sets

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
30-Meter Digital Elevation Model (DEM)
30-Meter Shaded Relief Map
301-Foot Digital Elevation Model (DEM)
301-Foot Shaded Relief Map

Water Resources
Statewide Data Sets

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

Illinois Geologic Quadrangle Data Products

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)
2005 Chicago Urban Area (CUA) Data
Download 2005 CUA Data, SPE (text-based)
Download 2005 CUA Data, UTM (text-based)
1998-2001 Digital Orthophoto Quad (DOQ) data
Download DOQs (text-based)
Download DOQs (image map)
Download DOQs (interactive map)
2000 Orthophotography, Des Plaines River Watershed
Download tiles (text-based)
Download tiles (image map)
1938-1941 Historical Aerial Photographs
Download photos (text-based)
Download photos (interactive map)