- Radio Communications Equipment & Systems , Houston
- Radio Stations & Broadcasting Companies, Houston
- Ready Mix Concrete, Houston - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Houston
- Real Estate, Houston - Agent, Broker & Companies
- Real Estate Agencies, Houston
- Real Estate Agent - Property Lessors, Houston
- Real Estate Services, Houston
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- Refrigeration Repair & Service, Houston - Ac, Freezer, Refrigerator Repair
- Religious Organizations, Houston
- Repair Services, Houston
- Residential, Houston
- Residential Apartments, Houston
- Residential Care Facilities, Houston
- Restaurant Management & Consulting, Houston - Food Facilities Consultants
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