- Cable TV Companies & Services, Houston
- Camper, Rvs & Travel Trailer Dealers, Houston
- Car Rental, Houston - Rental Cars & Lease Service
- Carpet & Carpet Equipment & Supplies Dealers, Houston
- Carpet & Rug Pads Lining & Accessories, Houston
- Cars, Truck, Van & SUV Car Dealerships, Houston - Auto Dealers
- Casual Dining Restaurants, Houston
- Catalog, Mail-Order & Electronic Shopping, Houston
- Caterers Food Services, Houston
- Catholic Churches, Houston
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Houston
- Cellular & Mobile Phone Service, Houston
- Central American Restaurants, Houston
- Charitable & Non-Profit Organizations, Houston
- Check Cashing Services, Houston
- Chemical Products, Houston - Chemical Distributors, Dealers, Wholesale, etc
- Chemicals Agricultural, Houston
- Chiropractor, Houston
- Christian Churches, Houston
- Christian Ministries, Houston
- Church Of Christ, Houston
- Church Of God, Houston
- Church Of The Nazarene, Houston
- Churches 1 Of 3, Houston
- Churches 2 Of 3, Houston
- Cigar, Cigarette & Tobacco Store & Supplies, Houston
- City & County Administrative Agencies, Houston
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- City & County Government, Houston
- City & County Law Enforcement, Houston
- Clinics, Houston
- CNC Machine Shop, Houston
- Commercial Equipment, Houston
- Commercial Printing, Houston
- Commercial Printing Manufacturers, Houston
- Communications Services, Houston
- Community Services, Houston
- Computer & Audio Visual Services, Houston
- Computer & Software Stores, Houston
- Computer Stores, Houston
- Computer Training Schools, Houston
- Concrete, Houston - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Houston
- Concrete Drainage Products & Culverts, Houston
- Concrete Product Manufacturers, Houston
- Construction, Houston
- Consultants & Services, Houston
- Convenience Stores, Houston
- Cosmetics & Perfumes Outlets, Houston
- County Police, Houston
- Credit Unions, Houston
- Crop Protection, Houston
- Culverts & Other Drainage Pipes, Houston
- Custom Parts & Accessories, Houston
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