- Race Car Manufacturers, South San Francisco
- Racing Car Supplies, South San Francisco
- Racing Including Track Operations, South San Francisco
- Radio & Television Repair Shops , South San Francisco - TV Repair
- Radio Stations & Broadcast Companies, South San Francisco - Radio, Television & Publishers Representatives
- Radiotelephone Communications, South San Francisco
- Railroad & Subway Construction Contractors, South San Francisco
- Railroad Contractors, South San Francisco
- Ready Mix Concrete, South San Francisco - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, South San Francisco
- Real Estate, South San Francisco - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, South San Francisco
- Real Estate Appraiser, South San Francisco - Appraisal Services
- Real Estate Appraisers & Consulting Services, South San Francisco
- Real Estate Developers, South San Francisco
- Real Estate Inspectors, South San Francisco - Real Estate Inspection Service
- Real Estate Investment Trusts, South San Francisco
- Real Estate Management, South San Francisco
- Real Estate Properties, South San Francisco
- Real Estate Property Investment Properties, South San Francisco
- Real Estate Services, South San Francisco
- Record Storage, Destruction & Management, South San Francisco
- Recording Studio - Equipment & Rental, South San Francisco
- Recording Studio Equipment, South San Francisco
- Records, Tapes, CDs - Used & Vintage, South San Francisco
- Recreational Good Manufacturers, South San Francisco
- Recreational Services, South San Francisco
- Recycling Drop-Off Centers, South San Francisco
- Refrigeration & Air Conditioning Contractors, South San Francisco - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , South San Francisco - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, South San Francisco - Ac, Freezer, Refrigerator Repair
- Rehabilitation Centers, Products & Services, South San Francisco
- Rehabilitation Specialists, South San Francisco
- Religious Education, South San Francisco
- Religious Goods & Church Supplies Stores, South San Francisco
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- Religious Organizations, South San Francisco
- Religious Practitioners, South San Francisco
- Religious Services, South San Francisco
- Relocation Services, South San Francisco
- Rental & Leasing Business Equipment, South San Francisco
- Repair Services, South San Francisco
- Research & Development Bureaus, South San Francisco - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, South San Francisco - Laboratories
- Research Services, South San Francisco
- Residential, South San Francisco
- Residential Apartments, South San Francisco
- Residential Care Facilities, South San Francisco
- Residential Landfills, South San Francisco
- Resorts & Hotels, South San Francisco
- Restaurant & Food Service Management Services, South San Francisco
- Restaurant Equipment, South San Francisco
- Restaurant Equipment & Supplies, South San Francisco
- Restaurant Equipment Repair & Service, South San Francisco - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Management & Consulting, South San Francisco - Food Facilities Consultants
- Restaurant Supplies & Equipment, South San Francisco
- Restaurants - Breakfast Brunch Lunch, South San Francisco
- Restaurants/Food & Dining, South San Francisco
- Retail Book Stores, South San Francisco
- Retail Recovery Services, South San Francisco
- Retaining Wall Contractors, South San Francisco - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement Communities & Home, Assisted Living & Apartments, South San Francisco
- Rifle & Pistol Ranges, South San Francisco
- Rigging Service & Crane Hoisting, South San Francisco
- Roadside Assistance, Road Service & Towing Service, South San Francisco
- Roofing & Siding Materials, Equipments & Supplies, South San Francisco - Wholesale, Manufacturers & Suppliers
- Roofing Consultants, South San Francisco - Roofing Companies
- Roofing Contractors, South San Francisco - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, South San Francisco
- Rubber Products, South San Francisco
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