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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 .
This page was last edited on 16 February 2024, at 23:10 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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.
The Chicago metropolitan area – also known as "Chicagoland" – is the metropolitan area associated with the city of Chicago, Illinois, and its suburbs. [2] With an estimated population of 9.4 million people, [ 3 ] it is the third largest metropolitan area in the United States [ 4 ] and the region most connected to the city through geographic ...
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 ...
Shortly after in 1996, area code 773 was created for the residential parts of the city of Chicago, while downtown kept area code 312. Area code 847 exhausted its numbers quickly, so that an overlay area code, 224, was implemented in 1996 for relief. However, mandatory ten-digit dialing was not in effect until 2002. In March 2007, an overlay ...
Pages in category "Defunct companies based in Illinois" The following 89 pages are in this category, out of 89 total. This list may not reflect recent changes .
Pages in category "Privately held companies based in Illinois" The following 80 pages are in this category, out of 80 total. This list may not reflect recent changes .