- Cabinets & Cabinet Hardware, Rockford
- Cabinets Refacing, Refinishing & Building, Rockford - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cable TV Companies & Services, Rockford
- Cafe Restaurants, Rockford
- Casual Dining Restaurants, Rockford
- Central American Restaurants, Rockford
- Child Care & Day Care Services, Rockford
- Chinese Restaurants, Rockford
- Chiropractor, Rockford
- Christian Churches, Rockford
- Christmas Decorations & Lights, Rockford
- Churches 1 Of 3, Rockford
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- Churches 2 Of 3, Rockford
- City & County Government, Rockford
- Cleaning & Restoration Contractors, Including Sandblasting, Rockford
- Cleaning Supplies & Products, Rockford
- CNC Machine Shop, Rockford
- Coating Engraving & Allied Services Manufacturing, Rockford
- Commercial Equipment, Rockford
- Commercial Printing, Rockford
- Communications Services, Rockford
- Community Services, Rockford
- Construction, Rockford
- Convenience Stores, Rockford
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