- Race Car Dealers, San Carlos
- Racing Car Supplies, San Carlos
- Radiator Coolant & Solvents, San Carlos - Engine Coolant
- Radio & Television Repair Shops , San Carlos - TV Repair
- Radio Communications Equipment & Systems , San Carlos
- Radiology Equipment & Services, San Carlos - X-Ray Equipment & Supplies
- Railroad Services, San Carlos
- Real Estate, San Carlos - Agent, Broker & Companies
- Real Estate Agencies, San Carlos
- Real Estate Agent - Property Lessors, San Carlos
- Real Estate Developers, San Carlos
- Real Estate Management, San Carlos
- Real Estate Properties, San Carlos
- Real Estate Property Investment Properties, San Carlos
- Real Estate Services, San Carlos
- Real Estate Support Services, San Carlos
- Record Destruction Service, San Carlos
- Record Storage, Destruction & Management, San Carlos
- Recording Studio - Equipment & Rental, San Carlos
- Records, Tapes, CDs - Used & Vintage, San Carlos
- Recreational Equipment & Supplies Companies, San Carlos
- Recreational Equipment Repair & Service, San Carlos
- Recreational Good Manufacturers, San Carlos
- Recreational Organizations, San Carlos
- Recreational Services, San Carlos
- Recycling Drop-Off Centers, San Carlos
- Recycling Scrap & Waste Materials, San Carlos - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, San Carlos
- Refrigeration & Air Conditioning Contractors, San Carlos - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , San Carlos - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, San Carlos - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, San Carlos
- Refuse Collection & Disposal, San Carlos
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- Refuse Collection & Disposal Services, San Carlos
- Refuse Systems & Garbage Disposal, San Carlos
- Rehabilitation Centers, Products & Services, San Carlos
- Rehabilitation Specialists, San Carlos
- Rehabilitational Job Training Services, San Carlos
- Religious Education, San Carlos
- Religious Organizations, San Carlos
- Repair Services, San Carlos
- Research & Development Bureaus, San Carlos - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, San Carlos - Laboratories
- Research Services, San Carlos
- Residential, San Carlos
- Residential Apartments, San Carlos
- Residential Architect, San Carlos
- Residential Care Facilities, San Carlos
- Residential Construction Contractors, San Carlos - General Contractors
- Residential Lighting Fixtures Manufacturers, San Carlos
- Restaurant & Lounge, Bar, Or Pub, San Carlos
- Restaurant Management & Consulting, San Carlos - Food Facilities Consultants
- Restaurants - Breakfast Brunch Lunch, San Carlos
- Restaurants/Food & Dining, San Carlos
- Retail Book Stores, San Carlos
- Retirement Communities & Home, Assisted Living & Apartments, San Carlos
- Riding Apparel & Equipment, San Carlos
- Road Construction Equipment & Machinery, San Carlos
- Roadside Assistance, Road Service & Towing Service, San Carlos
- Rock Shops, San Carlos
- Rodeo & Equestrian Equipment & Supplies, San Carlos
- Roofing & Siding Materials, Equipments & Supplies, San Carlos - Wholesale, Manufacturers & Suppliers
- Roofing Consultants, San Carlos - Roofing Companies
- Roofing Contractors, San Carlos - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, San Carlos
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