- Area: 56,400 square miles
- Highest Point: Charles Mound - 1,235 ft.
- 102 Counties
- Dominant Land Use:
- Cash Corn, oats, Soybeans
- Hogs, Soft Winter Wheat
- Cattle Feed, Hogs
- Hogs, Dairy
- Specialized Dairy
- General Farming, Dairy, Livestock, Poultry
- Pasture Livestock
- Urban Areas
- Major Mineral Occurences
- Coal
- Clay
- Fluorspar
- Limestone
- Petroleum
- Lead
- Zinc
- Rivers Bordering and Within the Boundaries of Illinois:
- Big Muddy
- Des Plaines
- Embarrass
- Fox
- Green
- Illinois
- Kankakee
- Kaskakia
- Kishwaukee
- La Moine
- Little Wabash
- Mackinaw
- Macoupin
- Mississippi
- Ohio
- Pecatonica
- Rock
- Saline
- Salt
- Salt Fork
- Sangamon
- Shoal
- Silver
- Skillet Fork
- Spoon
- Sugar
- Vermilion
- Wabash
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- Major Industrial Areas:
- Chicago-Northeastern Illinois:
- Machinery
- Metal & Electrical Products
- Food Processing
- Printing & Publishing
- Chemicals
- Iron & Steel
- Clothing
- Transportation Equipment
- Rockford:
- Machine Tools
- Machinery
- Metal Products
- Screws & Bolts
- Farm Equipment
- Rock Island-Moline:
- Machinery
- Metal Products
- Ordnance
- Farm Equipment
- Peoria:
- Machinery
- Metal Products
- Chemicals
- Food Processing
- Distilling
- Earth Movers
- Decatur:
- Machinery
- Metal Products
- Soybean & Corn Processing
- Food Processing
- Springfield:
- Electrical & Metal Products
- Machinery
- Tractors
- East St. Louis:
- Primary Metals
- Aluminum Products
- Chemicals
- Food Processing
- Oil Refining
- Building Materials
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