- AgResource Company
 - Chicago - Provides fundamentals-based market research and advisory services to the agricultural community. - Allendale, Inc.
- McHenry - Agriculture research firm which projects yearly price outlooks for grains and livestock.
- Ball Seed Company
- West Chicago - Offers flower and vegetable seed.
- Clarke Environmental Mosquito Management
- Roselle - Provides consultation and contract mosquito control services to governmental, public health, commercial and residential clients.
- Corn Products International, Inc.
- Bedford Park - global producer of refined corn and starch-based ingredients.
- Dawn Equipment Company
- Sycamore - Manufacturer of Trashwheels planter attachments.
- De Jong Equipment
- Beecher - New and used agricultural/industrial equipment dealer.
- H. D. Hudson Manufacturing Company
- Chicago - Maker of sprayers and dusters for commercial and residential use.
- Heartland Lysine, Inc.
- Chicago - Feed-grade amino acids for agricultural uses.
- IMC Global
- Lake Forest - Produces and supplies phosphate and potash crop nutrients, animal feed ingredients, and distributes crop nutrients.
- Lenjohnson.com
- Leland - Focusing on agriculture and the local rural community.
- Midwest Trading Horticultural Supplies, Inc.
- Saint Charles - From custom and pre-fab quonset huts to horticultural supplies and tools, visit our web site and fill out the catalogue request form.
- Seedburo Equipment Company
- Chicago - Manufacturer and distributor of handling, testing and grading equipment for the grain, feed and seed industries.
- Spectrum Technologies, Inc.
- Plainfield - Makers of weather monitoring and soil tesing equipment designed for agricultural applications.
- Walker-Schork International, Inc.
- Sycamore - Offering farm equipment.
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