- Race Car Dealers, Ontario
- Racing Car Supplies, Ontario
- Racing Fuels, Ontario
- Racing Including Track Operations, Ontario
- Radiator Coolant & Solvents, Ontario - Engine Coolant
- Radiator Repair, Ontario - Gas Tank Repair
- Radiator Repair & Rebuild, Ontario
- Radio & Television Repair Shops , Ontario - TV Repair
- Radio & Tv Communications Equipment Manufacturers, Ontario
- Radio Communications Equipment & Systems , Ontario
- Radio Equipment & Parts Stores & Dealers, Ontario
- Radio Stations & Broadcasting Companies, Ontario
- Radiology Equipment & Services, Ontario - X-Ray Equipment & Supplies
- Radios Citizens Band Repair, Ontario
- Radon Testing & Services, Ontario
- Railroad, Ontario - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Ontario
- Railroad Contractors, Ontario
- Raw Products, Ontario
- Ready Mix Concrete, Ontario - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Ontario
- Real Estate, Ontario - Agent, Broker & Companies
- Real Estate Agencies, Ontario
- Real Estate Agent & Broker Services, Ontario
- Real Estate Agent - Property Lessors, Ontario
- Real Estate Appraiser, Ontario - Appraisal Services
- Real Estate Appraisers & Consulting Services, Ontario
- Real Estate Attorneys & Lawyers, Ontario
- Real Estate Broker, Ontario
- Real Estate Consultants, Ontario
- Real Estate Developers, Ontario
- Real Estate Inspectors, Ontario - Real Estate Inspection Service
- Real Estate Lawyers & Attorneys, Ontario
- Real Estate Listings Services, Ontario
- Real Estate Management, Ontario
- Real Estate Properties, Ontario
- Real Estate Property Investment Properties, Ontario
- Real Estate Referral & Information Services, Ontario
- Real Estate Rental Information, Ontario
- Real Estate Rentals, Ontario
- Real Estate Services, Ontario
- Record Storage, Destruction & Management, Ontario
- Recording Studio - Equipment & Rental, Ontario
- Recording Studio Equipment, Ontario
- Records, Tapes, CDs - Used & Vintage, Ontario
- Recreation Management Services, Ontario
- Recreational Equipment & Supplies Companies, Ontario
- Recreational Equipment Repair & Service, Ontario
- Recreational Good Manufacturers, Ontario
- Recycling Drop-Off Centers, Ontario
- Recycling Scrap & Waste Materials, Ontario - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Ontario
- Reflective Materials & Products, Ontario
- Reformed Churches, Ontario
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- Refrigerant Recovery Equipment, Ontario
- Refrigerated Storage & Warehouse, Ontario - Warehousing
- Refrigeration & Cooling Equipment, Parts & Supplies , Ontario - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Ontario - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Ontario
- Refrigerator Sales, Service & Repair, Ontario - Fridge
- Rehabilitation Centers, Ontario
- Rehabilitation Centers, Products & Services, Ontario
- Rehabilitation Specialists, Ontario
- Rehabilitational Job Training Services, Ontario
- Relief Organizations, Ontario
- Religious Education, Ontario
- Religious Goods & Church Supplies Stores, Ontario
- Religious Organizations, Ontario
- Rental & Leasing Business Equipment, Ontario
- Repair Services, Ontario
- Reprographic Services, Ontario
- Research & Development Bureaus, Ontario - Commercial, Economic, Sociological & Educational Research
- Research Services, Ontario
- Residential, Ontario
- Residential Apartments, Ontario
- Residential Care Facilities, Ontario
- Residential Construction Contractors, Ontario - General Contractors
- Residential Lighting Fixtures Manufacturers, Ontario
- Resins Wholesale & Retail, Ontario - Plastic Raw Materials
- Resource Consultants, Ontario
- Restaurant & Food Service Management Services, Ontario
- Restaurant & Lounge, Bar, Or Pub, Ontario
- Restaurant Cuisine, Ontario
- Restaurant Equipment, Ontario
- Restaurant Equipment & Supplies, Ontario
- Restaurant Equipment Repair & Service, Ontario - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Lobster, Ontario
- Restaurant Management & Consulting, Ontario - Food Facilities Consultants
- Restaurant Supplies & Equipment, Ontario
- Restaurants - Breakfast Brunch Lunch, Ontario
- Restaurants/Food & Dining, Ontario
- Retirement Communities & Home, Assisted Living & Apartments, Ontario
- Rigging Equipment & Supplies, Ontario
- Rigging Service & Crane Hoisting, Ontario
- Road Construction, Ontario - Companies & Contractors
- Road Construction & Repair Contractors, Ontario
- Roadside Assistance, Road Service & Towing Service, Ontario
- Roller Skating Rinks, Ontario
- Roofing Consultants, Ontario - Roofing Companies
- Roofing Contractors, Ontario - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Ontario
- Rubber Products, Ontario
- Rubber Products - Retail, Ontario
- Rubber Stamps, Ontario
- RV & Campers Repair & Service, Ontario
- Rv Parks, Ontario
- RV Repair, Ontario - Recreational Vehicle
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