- Racing Car Supplies, St Catharines
- Rackets Restringing & Repair, St Catharines
- Radiator Coolant & Solvents, St Catharines - Engine Coolant
- Radio & Television Repair Shops , St Catharines - TV Repair
- Radio Communications Equipment & Systems , St Catharines
- Radio Stations & Broadcast Companies, St Catharines - Radio, Television & Publishers Representatives
- Radio Stations & Broadcasting Companies, St Catharines
- Radiotelephone Communications, St Catharines
- Reading Instruction Schools, St Catharines
- Ready Mix Concrete, St Catharines - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, St Catharines
- Real Estate, St Catharines - Agent, Broker & Companies
- Real Estate Agent & Broker Services, St Catharines
- Real Estate Agent - Property Lessors, St Catharines
- Real Estate Appraiser, St Catharines - Appraisal Services
- Real Estate Appraisers & Consulting Services, St Catharines
- Real Estate Attorneys & Lawyers, St Catharines
- Real Estate Broker, St Catharines
- Real Estate Consultants, St Catharines
- Real Estate Developers, St Catharines
- Real Estate Management, St Catharines
- Real Estate Rentals, St Catharines
- Real Estate Services, St Catharines
- Record Storage, Destruction & Management, St Catharines
- Recording Studio - Equipment & Rental, St Catharines
- Records, Tapes, CDs - Used & Vintage, St Catharines
- Recreational Equipment & Supplies Companies, St Catharines
- Recreational Equipment Repair & Service, St Catharines
- Recreational Organizations, St Catharines
- Recreational Services, St Catharines
- Recycling Drop-Off Centers, St Catharines
- Recycling Scrap & Waste Materials, St Catharines - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, St Catharines
- Reflexologists, St Catharines
- Reformed Churches, St Catharines
- Refrigerated Storage & Warehouse, St Catharines - Warehousing
- Refrigeration & Air Conditioning Contractors, St Catharines - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , St Catharines - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigerator Sales, Service & Repair, St Catharines - Fridge
- Refuse Collection & Disposal, St Catharines
- Refuse Collection & Disposal Services, St Catharines
- Refuse Systems & Garbage Disposal, St Catharines
- Rehabilitation Centers, Products & Services, St Catharines
- Rehabilitation Specialists, St Catharines
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- Rehabilitational Job Training Services, St Catharines
- Religious Education, St Catharines
- Religious Goods & Church Supplies Stores, St Catharines
- Religious Organizations, St Catharines
- Rental & Leasing Business Equipment, St Catharines
- Repair Services, St Catharines
- Reprographic Services, St Catharines
- Research & Development Bureaus, St Catharines - Commercial, Economic, Sociological & Educational Research
- Research Services, St Catharines
- Residential, St Catharines
- Residential Apartments, St Catharines
- Residential Architect, St Catharines
- Residential Care Facilities, St Catharines
- Residential Construction Contractors, St Catharines - General Contractors
- Residential Construction Referral Services, St Catharines
- Residential Lighting Fixtures Manufacturers, St Catharines
- Restaurant & Food Service Management Services, St Catharines
- Restaurant & Lounge, Bar, Or Pub, St Catharines
- Restaurant Equipment, St Catharines
- Restaurant Equipment & Supplies, St Catharines
- Restaurant Equipment Repair & Service, St Catharines - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Supplies & Equipment, St Catharines
- Restaurants - Breakfast Brunch Lunch, St Catharines
- Restaurants/Food & Dining, St Catharines
- Restoration Contractors, St Catharines
- Resume Service, St Catharines
- Retail Book Stores, St Catharines
- Retirement & Estate Planning, St Catharines
- Retirement Communities & Home, Assisted Living & Apartments, St Catharines
- Retirement Homes, St Catharines
- Retirement Planning Consultants & Services, St Catharines
- Riding & Rodeo Services, St Catharines
- Riding Apparel & Equipment, St Catharines
- Road Construction, St Catharines - Companies & Contractors
- Road Construction & Repair Contractors, St Catharines
- Roadside Assistance, Road Service & Towing Service, St Catharines
- Rods, Springs & Suspension Equipment & Supplies, St Catharines
- Roofing Consultants, St Catharines - Roofing Companies
- Roofing Contractors, St Catharines - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, St Catharines
- Rubber Products - Retail, St Catharines
- Rv Parks, St Catharines
- Ryder Truck Rental , St Catharines - Ryder Moving
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