- Carpet, Rug & Linoleum Flooring Dealers, Caseyville
- Casual Dining Restaurants, Caseyville
- Catholic Churches, Caseyville
- Central American Restaurants, Caseyville
- Charismatic Church, Caseyville
- Chemicals & Related Products, Caseyville
- Christian Churches, Caseyville
- Church Of God, Caseyville
- Churches 1 Of 3, Caseyville
- Churches 2 Of 3, Caseyville
- Churches Seventh Day Adventist, Caseyville
- City & County Government, Caseyville
- Cleaning & Restoration Contractors, Including Sandblasting, Caseyville
- Cleaning Supplies, Systems & Equipment, Caseyville - Janitorial Supplies
- Clothing Stores, Caseyville - Clothes & Accessories
- CNC Machine Shop, Caseyville
- Cocktail Lounges, Caseyville
- Community & Recreational Facilities, Caseyville
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- Community Services, Caseyville
- Computer & Software Stores, Caseyville
- Computer Repair, Caseyville
- Computer Software & Services, Caseyville
- Computer Software Service, Caseyville
- Concrete, Caseyville - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Caseyville
- Concrete Contractors, Caseyville - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Caseyville
- Construction, Caseyville
- Construction Services, Caseyville
- Consultants & Services, Caseyville
- Convenience Stores, Caseyville
- Convention & Meeting Facilities, Caseyville - Meeting Rooms
- Country Clubs, Caseyville
- Credit Reporting Agencies, Caseyville
- Curtains, Drapes & Window Treatments and Coverings, Caseyville - Drapery & Upholstery Fabric Stores
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