- Racquetball Courts, San Marcos
- Radiator Coolant & Solvents, San Marcos - Engine Coolant
- Radiators Heating, San Marcos
- Radio & Television Repair Shops , San Marcos - TV Repair
- Radio & Tv Communications Equipment Manufacturers, San Marcos
- Radiologists, San Marcos - Radiology Doctors, Physicians & Surgeons
- Radiology Equipment & Services, San Marcos - X-Ray Equipment & Supplies
- Radiotelephone Communications, San Marcos
- Rail Line Travel Agents & Agencies, San Marcos
- Railroad, San Marcos - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, San Marcos
- Railroad Companies, San Marcos
- Railroad Contractors, San Marcos
- Range & Oven Repair, Service & Sales, San Marcos
- Ready Mix Concrete, San Marcos - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, San Marcos
- Real Estate, San Marcos - Agent, Broker & Companies
- Real Estate & Property Brokers, San Marcos
- Real Estate Agent - Property Lessors, San Marcos
- Real Estate Appraiser, San Marcos - Appraisal Services
- Real Estate Appraisers & Consulting Services, San Marcos
- Real Estate Attorneys & Lawyers, San Marcos
- Real Estate Attorneys & Lawyers, San Marcos
- Real Estate Consultants, San Marcos
- Real Estate Inspectors, San Marcos - Real Estate Inspection Service
- Real Estate Lawyers & Attorneys, San Marcos
- Real Estate Listings Services, San Marcos
- Real Estate Management, San Marcos
- Real Estate Rentals, San Marcos
- Real Estate Services, San Marcos
- Real Estate Services Franchises, San Marcos
- Recording Studio - Equipment & Rental, San Marcos
- Recording Studio Service - Sound & Video, San Marcos
- Records, Tapes, CDs - Used & Vintage, San Marcos
- Records, Tapes, Compact Discs Wholesale, San Marcos
- Recreation Management Services, San Marcos
- Recreational Equipment & Supplies Companies, San Marcos
- Recreational Services, San Marcos
- Recycling Drop-Off Centers, San Marcos
- Recycling Scrap & Waste Materials, San Marcos - Scrap Metal, etc
- Reebok Shoes, San Marcos
- Refrigeration & Cooling Equipment, Parts & Supplies , San Marcos - Water Cooler, Ice Machine, Beverage Dispenser, etc
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- Refrigeration Repair & Service, San Marcos - Ac, Freezer, Refrigerator Repair
- Refuse Collection & Disposal Services, San Marcos
- Rehabilitation Centers, Products & Services, San Marcos
- Rehabilitation Specialists, San Marcos
- Rehabilitational Job Training Services, San Marcos
- Religious Education, San Marcos
- Religious Organizations, San Marcos
- Rental & Leasing Business Equipment, San Marcos
- Rental Property Management, San Marcos
- Repair Services, San Marcos
- Research & Development Bureaus, San Marcos - Commercial, Economic, Sociological & Educational Research
- Research Services, San Marcos
- Residential, San Marcos
- Residential Apartments, San Marcos
- Residential Architect, San Marcos
- Residential Architectural Designers, San Marcos
- Residential Care Facilities, San Marcos
- Residential Construction Contractors, San Marcos - General Contractors
- Residential Landfills, San Marcos
- Resorts & Hotels, San Marcos
- Respiratory Medical Services, San Marcos
- Respiratory Therapy, San Marcos
- Restaurant & Food Service Management Services, San Marcos
- Restaurant & Lounge, Bar, Or Pub, San Marcos
- Restaurant Equipment Repair & Service, San Marcos - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Management & Consulting, San Marcos - Food Facilities Consultants
- Restaurants - Breakfast Brunch Lunch, San Marcos
- Restaurants/Food & Dining, San Marcos
- Restoration Church, San Marcos
- Restoration Contractors, San Marcos
- Retail Book Stores, San Marcos
- Retirement & Estate Planning, San Marcos
- Retirement Communities & Home, Assisted Living & Apartments, San Marcos
- Retirement Planning Consultants & Services, San Marcos
- Road Construction, San Marcos - Companies & Contractors
- Road Construction & Repair Contractors, San Marcos
- Roadside Assistance, Road Service & Towing Service, San Marcos
- Roofing Consultants, San Marcos - Roofing Companies
- Roofing Contractors, San Marcos - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rooming & Boarding Houses, San Marcos
- Rv Parks, San Marcos
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