- Racing Including Track Operations, Sarnia
- Radiation Detection Services, Sarnia
- Radio & Television Repair Shops , Sarnia - TV Repair
- Radio Communications Equipment & Systems , Sarnia
- Radio Stations & Broadcast Companies, Sarnia - Radio, Television & Publishers Representatives
- Radio Stations & Broadcasting Companies, Sarnia
- Radiologists, Sarnia - Radiology Doctors, Physicians & Surgeons
- Railroad, Sarnia - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Sarnia
- Railroad Cars Manufacturers, Sarnia
- Railroad Companies, Sarnia
- Railroad Contractors, Sarnia
- Railroad Equipment & Supplies Manufacturers, Sarnia
- Ready Mix Concrete, Sarnia - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Sarnia
- Real Estate, Sarnia - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Sarnia
- Real Estate Agent - Property Lessors, Sarnia
- Real Estate Appraiser, Sarnia - Appraisal Services
- Real Estate Appraisers & Consulting Services, Sarnia
- Real Estate Broker, Sarnia
- Real Estate Consultants, Sarnia
- Real Estate Developers, Sarnia
- Real Estate Management, Sarnia
- Real Estate Rentals, Sarnia
- Real Estate Services, Sarnia
- Real Estate Staging Service, Sarnia
- Record Destruction Service, Sarnia
- Record Storage, Destruction & Management, Sarnia
- Recording Studio - Equipment & Rental, Sarnia
- Recording Studio Service - Sound & Video, Sarnia
- Records, Tapes, CDs - Used & Vintage, Sarnia
- Recreational Equipment & Supplies Companies, Sarnia
- Recreational Equipment Repair & Service, Sarnia
- Recreational Good Manufacturers, Sarnia
- Recreational Organizations, Sarnia
- Recreational Services, Sarnia
- Recycling Drop-Off Centers, Sarnia
- Recycling Scrap & Waste Materials, Sarnia - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Sarnia
- Reflexologists, Sarnia
- Reformed Churches, Sarnia
- Refrigeration & Air Conditioning Contractors, Sarnia - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Sarnia - Water Cooler, Ice Machine, Beverage Dispenser, etc
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- Refrigeration Repair & Service, Sarnia - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Sarnia - Fridge
- Rehabilitation Centers, Products & Services, Sarnia
- Rehabilitation Specialists, Sarnia
- Rehabilitational Job Training Services, Sarnia
- Religious Education, Sarnia
- Religious Goods & Church Supplies Stores, Sarnia
- Religious Organizations, Sarnia
- Rental & Leasing Business Equipment, Sarnia
- Repair Services, Sarnia
- Research & Development Bureaus, Sarnia - Commercial, Economic, Sociological & Educational Research
- Research Services, Sarnia
- Residential, Sarnia
- Residential Apartments, Sarnia
- Residential Architect, Sarnia
- Residential Care Facilities, Sarnia
- Residential Construction Contractors, Sarnia - General Contractors
- Residential Electricians, Sarnia - Electric Contractors
- Residential Landfills, Sarnia
- Restaurant & Food Service Management Services, Sarnia
- Restaurant & Lounge, Bar, Or Pub, Sarnia
- Restaurant Equipment, Sarnia
- Restaurant Equipment & Supplies, Sarnia
- Restaurant Equipment Repair & Service, Sarnia - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Management & Consulting, Sarnia - Food Facilities Consultants
- Restaurant Supplies & Equipment, Sarnia
- Restaurants/Food & Dining, Sarnia
- Restoration Contractors, Sarnia
- Retirement & Estate Planning, Sarnia
- Retirement Communities & Home, Assisted Living & Apartments, Sarnia
- Retirement Planning Consultants & Services, Sarnia
- Reweavers Garment Services, Sarnia
- Road Construction, Sarnia - Companies & Contractors
- Road Construction & Repair Contractors, Sarnia
- Road Construction Equipment & Machinery, Sarnia
- Roadside Assistance, Road Service & Towing Service, Sarnia
- Roofing & Siding Materials, Equipments & Supplies, Sarnia - Wholesale, Manufacturers & Suppliers
- Roofing Consultants, Sarnia - Roofing Companies
- Roofing Contractors, Sarnia - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Sarnia
- Rubber Products, Sarnia
- Rubber Products - Retail, Sarnia
- Rubber Stamps, Sarnia
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