• [+] Companies based in Illinois by county (16 C)
• [+] Defunct companies based in Illinois (1 C, 72 P)

*

• [+] Banks based in Illinois (21 P)

* cont.

• [+] Beer brewing companies based in Illinois (6 P)
• [+] Insurance companies based in Illinois (17 P)
• [+] Law firms based in Illinois (1 C)

* cont.

• [+] Motor vehicle assembly plants in Illinois (3 P)
• [+] Illinois wineries (5 P)

C

• [+] Credit unions of Illinois (2 P)

• List of companies in the Chicago metropolitan area
• List of Illinois companies
• Template:Illinois Corporations

A

• A. E. Staley
• Abt Electronics
• Access Commerce
• Aero Composites
• Airtronic USA
• Alton Steel
• Associated Apparel Industries, Inc.
• American Rail Heritage Ltd.
• American River Transportation Company
• American Sammy
• American Yvette Company
• Andrew Corporation
• Archer Daniels Midland
• Argosy Gaming Company
• ArmaLite
• Aventine Renewable Energy

B

• Basler Electric
• Believers Broadcasting Corporation
• Bell Sports Inc.
• Benedek Broadcasting
• Biflex Products Corporation
• Bradford Exchange
• Bunn-o-Matic Corporation

C

• Cancer Treatment Centers of America
• Centel
• Central Illinois Public Service Company
• Central Lake County Joint Action Water Agency
• Central West Public Service Corporation

C cont.

• Classic World Productions
• CNH Global
• Cobb and Frost
• Computhink
• Confinity
• Coskata, Inc.
• Crowdspring

D

• DC Advertising
• Davka
• Dawn Equipment Company
• Daxcon
• Deere & Company
• DEKALB Genetics Corporation
• Detonics
• Dick Blick Art Materials
• Donlen Corporation
• Dot Foods
• Dur-O-Lite Pencil Company

E

• Eagle Food Centers
• Eagle Test Systems
• Elgin National Watch Company
• Elliott Aviation
• Empire Carpet
• Empire Today
• Enesco
• Essanay Studios
• EV Interactive

F

• Federal Signal Corporation
• First Alert
• First Midwest Bancorp, Inc.

G

• Gardner Denver

G cont.

• Gaylord Container Corporation
• General Steel Industries
• Glastex
• Glidden (paints)
• Gogo Inflight Internet
• Goodheart – Willcox Publishing Company
• User:Moresells/GreenCells

H

• Harrisonville Telephone Company
• Hendrickson International
• The Hertz Corporation
• Holt Manufacturing Company

I

• Incredible Technologies
• International Pool Tour
• Intersog
• Itty bitty machine company

J

• Convia
• Jellyfish (media company)
• Johnson Outboards

K

• K's Merchandise Mart

M

• Monical's Pizza

N

• Nabih's Inc.
• National Railway Equipment Company

P

• User:Pete.kehoe
• User:Peterbx9
• Plochman's

S

• STRATA
• Sagus International
• Star Transport
• User talk:Stuartfost/Crowdspring

W

• Wicks Organ Company