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Companies Headquartered in Illinois

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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.
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  • 1

    A. E. Staley

  • 2

    Alton Steel

  • 3

    American River Transportation Company

    Transportation, Water Transportation
  • 4

    Archer Daniels Midland

    Food Manufacturing, Agriculture
  • 5

    ArmaLite

    Arms industry, Arms Manufacturers
  • 6

    Aventine Renewable Energy

  • 7

    Axium Foods

  • 8

    Basler Electric

  • 9

    Beer Nuts

  • 10

    Believers Broadcasting Corporation

  • 11

    Bell Sports

  • 12

    Bunn-o-Matic Corporation

  • 13

    Busey Bank

    State Commercial Banks, Financial Services
  • 14

    Caterpillar Inc.

    Financial Services, Construction Machinery and Equipment
  • 15

    City Water, Light & Power

  • 16

    Country Financial

  • 17

    Dawn Equipment Company

  • 18

    DAXCON Engineering, Inc.

  • 19

    John Deere

    Manufacturing
  • 20

    DEKALB Genetics Corporation

  • 21

    Detonics

  • 22

    Dot Foods

  • 23

    Elliott Aviation

    Aerospace
  • 24

    Estwing

    Manufacturing
  • 25

    Eureka! Tent Company

    Backpacking