A list of Illinoisan companies. Many well known Illinois companies have been included. While this list isn't definitive, these are most of the top businesses in the state of Illinois. As a country, the United States has encouraged entrepreneurship throughout much of its history. The state of Illinois is no exception to this rule, and new businesses are started in Illinois daily, ranging from corporations to LLCs to partnerships to sole proprietorships. This list, however, is mostly focused on the largest corporations in the state of Illinois.
A. E. Staley
American River Transportation Company Transportation, Water Transportation, Inland Water Freight Transportation
Archer Daniels Midland Food Manufacturing, Agriculture, Food processing
ArmaLite Arms industry, Arms Manufacturers
Aventine Renewable Energy
Believers Broadcasting Corporation
Busey Bank State Commercial Banks, Financial Services
Caterpillar Inc. Financial Services, Construction Machinery and Equipment
City Water, Light & Power
Dawn Equipment Company
DAXCON Engineering, Inc.
John Deere Manufacturing
DEKALB Genetics Corporation
Elliott Aviation Aerospace
Eureka! Tent Company Backpacking