• ILGISA - Illinois Geographic Information Systems Association
• Watershed Mapping
• Metropolitan Planning Council
• Lake Michigan Water Levels ....[alt]
• USACE Chicago District ....alternate site
• Rockford Map Publishers
• Illinois Land Patents issued between 1820 and 1908 from the BLM, Eastern States, General Land Office records
• Datasets at the GIS Data Depot
• Data Resource List at mapfacts.com
• Mapping Products from the USGS
  • 7.5 minute Digital Elevation Models
  • 1:12,000 Digital Orthophoto Quads
  • 1 degree Digital Raster Graphics of scanned topo quads
  • 7.5 minute Digital Line Graph
    • hypsography (contours)
    • Survey Control
    • and others
  • Aerial Photography
• USGS Map Dealers
• Illinois Virtual Tourist list of web servers in the state
• City-Net list of State net sites
• KidSpace at the Internet Public Library
• Yahoo list of Illinois sites
• Index of County and Municipal Sites, on wowworks.com
• Stateline.org
• State Legislative page
• Opinions of the Illinois Supreme and Appellate Courts
• the Official State site
• State of Illinois Gateway
  • Government Links
  • Governmental Records
  • Current Illinois Register
• Access Illinois
• Illinois Dept. of Natural Resources
• Illinois Association for Floodplain and Stormwater Management
• List of Endangered Species from the US Fish and Wildlife Service
• Illinois Dept. of Transportation
• Illinois State Museum
• Illinois Railway Museum
• Illinois Natural History Survey maintains a Geospatial Data Clearinghouse
• Illinois State Geological Survey
• Illinois Water Resources Division of the USGS
• Illinois Fact Sheet of USGS programs in the State ....alternate site
• Illinois State Archives is home to the Public Domain Land Tract Sales Records
• Federal Depository Libraries in Illinois
• Infobahn Outfitters maintains some historical information.
• Maps
  • available from IDOT
  • available from IL State Geological Survey
  • from SAST
  • Illinois Waterway Charts from USACE
  • the EPA Map Library
  • more at EPA
• Technology Resource Center
• CAGIS , the Chicago Area Geographic Information Study at UIC
• Illinois Freedom of Information Act
• Midwestern Climate Center
• Illinois Weather: COD [IWIN] [TAMU] [OSU] [WxNet] [UCD] [UKy] [UIUC] [UCAR] [LOT] [DVN] [UniSys] [Intellicast] [WxWeenie] [WxUSA Weather Hub [AccuWx] and Flood Risk graphic
• Illinois River Stage Forecasts
• Illinois Climatologies
• Illinois Environmental Protection Agency
• Illinois State Parks and Nature Areas
• Great Lakes Information Network (GLIN)
• Great Lakes Regional Environmental Information System
• Chicagoland live Traffic data, with congestion map, travel times, and speeds by loop detectors. Nice piece of work.
• Chicago Title Insurance Company
• Lake County Contractors Association

Election Campaign Contribution Data: http://www.followthemoney.org/database/stateview.phtml?s=IL

lists of local   Internet Service Providers in Illinois

• The List
• ISPs.com
• Downstate providers from Infobahn Outfitters
• Chicagoland proviers list

a great list of [Inter-]National Providers and On-Line Services which also provide access.

This page maintained episodically by the Online Resources for Land Surveying & Geomatics site. Your comments are welcome and appreciated.