- Cable TV Companies & Services, Houston
- Cafe Restaurants, Houston
- Cars, Truck, Van & SUV Car Dealerships, Houston - Auto Dealers
- Casual Dining Restaurants, Houston
- Catholic Churches, Houston
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Houston
- Cellular & Mobile Phone Service, Houston
- Chambers Of Commerce, Houston
- Check Cashing Services, Houston
- Child Care & Day Care Services, Houston
- Chinese Restaurants, Houston
- Chiropractic Clinics, Houston
- Chiropractor, Houston
- Christian Churches, Houston
- Church Of God, Houston
- Church Of Jesus Christ Of Latter Day Saints, Houston
- Churches 1 Of 3, Houston
- Churches Seventh Day Adventist, Houston
- Cigar, Cigarette & Tobacco Store & Supplies, Houston
- City & County Administrative Agencies, Houston
- City & County Government, Houston
- Clinics, Houston
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- Cocktail Lounges, Houston
- Commercial Equipment, Houston
- Commercial Printing Manufacturers, Houston
- Commodity & Merchandise Storage & Warehouse, Houston - Warehousing
- Communications Services, Houston
- Community & Recreational Facilities, Houston
- Community Services, Houston
- Computer Services, Houston
- Concrete, Houston - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Houston
- Concrete Contractors, Houston - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Houston
- Construction, Houston
- Construction Companies, Houston
- Consultants & Services, Houston
- Continuing Education, Houston
- Contractor Equipment & Supplies, Houston - Construction Equipment & Machinery
- Convenience Stores, Houston
- Counseling Services, Houston
- Country Cooking Restaurants, Houston
- Crushed Stone & Rock, Houston - Crushed Granite, Concrete, Gravel, etc
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