- Racing Car Supplies, San Marcos
- Radiator Coolant & Solvents, San Marcos - Engine Coolant
- Radio & Television Repair Shops , San Marcos - TV Repair
- Radio Communications Equipment & Systems , San Marcos
- Radio Stations & Broadcasting Companies, San Marcos
- Radiology Equipment & Services, San Marcos - X-Ray Equipment & Supplies
- Radiotelephone Communications, San Marcos
- Reading Instruction Schools, 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 Agent & Broker Services, 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 Broker, San Marcos
- Real Estate Developers, San Marcos
- Real Estate Management, San Marcos
- Real Estate Rentals, San Marcos
- Real Estate Services, San Marcos
- Real Estate Services Franchises, San Marcos
- Record Storage, Destruction & Management, San Marcos
- Recreational Equipment & Supplies Companies, San Marcos
- Recreational Equipment Repair & Service, San Marcos
- Recycling Drop-Off Centers, San Marcos
- Recycling Scrap & Waste Materials, San Marcos - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, San Marcos
- Reformed Churches, San Marcos
- Refrigeration & Cooling Equipment, Parts & Supplies , San Marcos - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, San Marcos - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, San Marcos - Fridge
- Refuse Collection & Disposal Services, San Marcos
- Rehabilitation Centers, Products & Services, San Marcos
- Rehabilitation Specialists, San Marcos
- Religious Education, San Marcos
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- Religious Organizations, San Marcos
- Religious Practitioners, San Marcos
- Religious Services, San Marcos
- Rental & Leasing Business Equipment, 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 Care Facilities, San Marcos
- Residential Construction Contractors, San Marcos - General Contractors
- Residential Real Estate Companies, San Marcos
- Resorts & Hotels, San Marcos
- Resorts Time Share, San Marcos
- Resource Centers, San Marcos
- Restaurant & Lounge, Bar, Or Pub, San Marcos
- Restaurant Equipment, San Marcos
- Restaurant Equipment & Supplies, San Marcos
- Restaurant Equipment Repair & Service, San Marcos - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Management & Consulting, San Marcos - Food Facilities Consultants
- Restaurant Supplies & Equipment, San Marcos
- Restaurants - Breakfast Brunch Lunch, San Marcos
- Restaurants/Food & Dining, San Marcos
- Restoration Contractors, San Marcos
- Retail Book Stores, San Marcos
- Retirement Communities & Home, Assisted Living & Apartments, San Marcos
- Riding & Rodeo Services, San Marcos
- Riding Apparel & Equipment, San Marcos
- Risk Management Consultants, San Marcos
- Rock Shops, San Marcos
- Roofing Consultants, San Marcos - Roofing Companies
- Roofing Contractors, San Marcos - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, San Marcos
- Rubber Products - Manufacturers, San Marcos
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