- Cafe Restaurants, Rockford
- Camper, Rvs & Travel Trailer Dealers, Rockford
- Campgrounds, Rockford
- Candy, Nut & Confectionery Wholesale & Retail, Rockford - Candy Stores
- Car Detailing & Wash Service, Rockford - Auto Detailing
- Car Rental, Rockford - Rental Cars & Lease Service
- Car Wash, Cleaning, Wax & Polish Service, Rockford
- Cargo Containers, Rockford - Freight Containers
- Carpet & Rug Cleaners Water Extraction & Restoration, Rockford
- Carpet Rug & Upholstery Cleaners, Rockford
- Carpet, Rug & Linoleum Flooring Dealers, Rockford
- Cars, Truck, Van & SUV Car Dealerships, Rockford - Auto Dealers
- Casual Dining Restaurants, Rockford
- Caterers Food Services, Rockford
- Catholic Churches, Rockford
- Cellular & Mobile Phone Service, Rockford
- Central American Restaurants, Rockford
- Ceramic Equipment & Supplies, Rockford
- Chalkboards Retail, Rockford
- Chambers Of Commerce, Rockford
- Child Care & Day Care Services, Rockford
- Child Related Social Services, Rockford
- Children & Family Entertainment, Rockford
- Children's Clothing Stores, Rockford - Infant, Babies & Kids Clothing
- Chinese Restaurants, Rockford
- Chiropractor, Rockford
- Christian Churches, Rockford
- Christmas Trees & Wreaths Retail, Rockford
- Church Furnishings & Equipment, Rockford
- Church Of Christ, Rockford
- Church Of God, Rockford
- Church Of The Nazarene, Rockford
- Churches 1 Of 3, Rockford
- Churches 2 Of 3, Rockford
- Churches 3 Of 3, Rockford
- Churches Christian Science, Rockford
- Cigar, Cigarette & Tobacco Store & Supplies, Rockford
- City & County Administrative Agencies, Rockford
- City & County Government, Rockford
- City & County Law Enforcement, Rockford
- Cleaning & Maintenance Services, Rockford
- Cleaning & Restoration Contractors, Including Sandblasting, Rockford
- Cleaning Supplies & Products, Rockford
- Clergy, Rockford
- Clinics, Rockford
- Clothing & Accessories Resale & Consignment Shops, Rockford
- Clothing Stores, Rockford - Clothes & Accessories
- Clown Supplies, Rockford
- Clowns, Rockford
- CNC Machine Shop, Rockford
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- Coaching Business & Personal, Rockford
- Coatings Vacuum Deposition, Rockford
- Cocktail Lounges, Rockford
- Coffee, Espresso & Tea House Restaurants, Rockford
- Collapsible Containers, Rockford
- Collection Agency Services, Rockford
- Collision Repair & Services, Rockford
- Commercial Equipment, Rockford
- Commercial Printing, Rockford
- Commercial Printing Manufacturers, Rockford
- Communication Equipment & Systems, Rockford
- Communications Consultants, Rockford
- Communications Contractors, Rockford
- Communications Services, Rockford
- Community & Recreational Facilities, Rockford
- Community Church, Rockford
- Community Churches, Rockford
- Community Services, Rockford
- Computer & Audio Visual Services, Rockford
- Computer & Laptop Repair, Rockford - PC Repair Services
- Computer Cable & Wire Installation, Rockford
- Computer Networks, Rockford - Design & Systems
- Computer Repair, Rockford
- Computer Room - Installation & Equipment, Rockford
- Concrete Contractors, Rockford - Concrete Construction & Concrete Companies
- Condominium Management, Rockford
- Congregational Church, Rockford
- Construction, Rockford
- Construction & Civil Engineer, Rockford
- Construction Equipment Rental & Leasing, Rockford
- Construction Inspectors, Rockford
- Construction Services, Rockford
- Consultants & Services, Rockford
- Consulting Services, Rockford - Internet Consultants
- Contact Lenses, Rockford
- Convenience Stores, Rockford
- Convention & Meeting Facilities, Rockford - Meeting Rooms
- Conveyor & Conveying Equipment, Rockford - Conveyor Belt
- Cooking, Food & Beverage Equipment, Rockford
- Counseling Services, Rockford
- Country Clubs, Rockford
- County Police, Rockford
- Craft Supplies, Rockford - Hobby & Craft Stores
- Cranes & Derricks, Rockford
- Credit & Debt Counseling Services, Rockford
- Credit Restoration Service, Rockford
- Credit Unions, Rockford
- Cremation Services, Supplies & Equipment, Rockford
- Cruise Agents, Rockford - Travel Agents
- Cruise Lines, Rockford - Cruises
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