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This is a list of Illinois companies which includes notable companies that are headquartered in Illinois, or were previously headquartered in Illinois. In general, this list does not include companies headquartered in one of the municipalities of the Chicago metropolitan area .
There are 102 counties in Illinois. The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. The largest by land area is McLean County, while the smallest is Putnam County. Illinois's FIPS state code is 17 and its postal abbreviation is IL.
Companies based in Cook County, Illinois (10 C, 106 P) D. Companies based in DeKalb County, Illinois (7 P) Companies based in DuPage County, Illinois (2 C, 93 P) F.
Transportation companies based in Illinois (2 C, 12 P) Pages in category "Companies based in Illinois" The following 24 pages are in this category, out of 24 total.
This is a list of the area codes in the state of Illinois and its numbering plan areas in the North American Numbering Plan.. All NPAs within Illinois. 217/447: Central Illinois, including the region running west from the Illinois-Indiana border through Danville, Effingham, Champaign–Urbana, Decatur, Springfield, Quincy until Illinois' western border with Missouri and Iowa
This is an accepted version of this page This is the latest accepted revision, reviewed on 25 January 2025. "Cities in Illinois" redirects here. For unincorporated communities, see List of unincorporated communities in Illinois. For CDPs, see List of census-designated places in Illinois. Map of the United States with Illinois highlighted Illinois is a state located in the Midwestern United ...
Here's a look at all the businesses that are either headquartered or have a facility in Illinois that made the list. Illinois’ best midsize employers according to Forbes Alzheimer's Association ...
Date/Time Thumbnail Dimensions User Comment; current: 14:18, 2 February 2007: 3,453 × 6,157 (83 KB): Dual Freq: This is a map showing Illinois counties Modification of David Benbennick's map.