- Racing Car Supplies, Markham
- Racing Including Track Operations, Markham
- Radiator Coolant & Solvents, Markham - Engine Coolant
- Radio & Television Repair Shops , Markham - TV Repair
- Radio Communications Equipment & Systems , Markham
- Radio Stations & Broadcast Companies, Markham - Radio, Television & Publishers Representatives
- Radio Stations & Broadcasting Companies, Markham
- Radiology Equipment & Services, Markham - X-Ray Equipment & Supplies
- Radiotelephone Communications, Markham
- Ready Mix Concrete, Markham - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Markham
- Real Estate, Markham - Agent, Broker & Companies
- Real Estate Agencies, Markham
- Real Estate Agent & Broker Services, Markham
- Real Estate Agent - Property Lessors, Markham
- Real Estate Appraiser, Markham - Appraisal Services
- Real Estate Appraisers & Consulting Services, Markham
- Real Estate Attorneys & Lawyers, Markham
- Real Estate Broker, Markham
- Real Estate Consultants, Markham
- Real Estate Developers, Markham
- Real Estate Lawyers & Attorneys, Markham
- Real Estate Management, Markham
- Real Estate Properties, Markham
- Real Estate Property Investment Properties, Markham
- Real Estate Rentals, Markham
- Real Estate Services, Markham
- Record Storage, Destruction & Management, Markham
- Records, Tapes, CDs - Used & Vintage, Markham
- Recreational Good Manufacturers, Markham
- Recreational Organizations, Markham
- Recreational Services, Markham
- Recycling Drop-Off Centers, Markham
- Recycling Scrap & Waste Materials, Markham - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Markham
- Reflexologists, Markham
- Refrigerated Beverage Dispenser, Markham - Water Coolers Equipment & Supplies
- Refrigerated Storage & Warehouse, Markham - Warehousing
- Refrigeration & Air Conditioning Contractors, Markham - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Markham - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Markham - Ac, Freezer, Refrigerator Repair
- Refuse Collection & Disposal Services, Markham
- Refuse Systems & Garbage Disposal, Markham
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- Rehabilitation Centers, Products & Services, Markham
- Rehabilitation Specialists, Markham
- Rehabilitational Job Training Services, Markham
- Religious Goods & Church Supplies Stores, Markham
- Religious Organizations, Markham
- Rental & Leasing Business Equipment, Markham
- Repair Services, Markham
- Research & Development Bureaus, Markham - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Markham - Laboratories
- Research Clinics, Markham
- Research Services, Markham
- Residential, Markham
- Residential Apartments, Markham
- Residential Architect, Markham
- Residential Care Facilities, Markham
- Residential Construction Contractors, Markham - General Contractors
- Residential Electricians, Markham - Electric Contractors
- Residential Lighting Fixtures Manufacturers, Markham
- Restaurant & Food Service Management Services, Markham
- Restaurant Equipment, Markham
- Restaurant Equipment & Supplies, Markham
- Restaurant Equipment Repair & Service, Markham - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Management & Consulting, Markham - Food Facilities Consultants
- Restaurant Supplies & Equipment, Markham
- Restaurants - Breakfast Brunch Lunch, Markham
- Restaurants/Food & Dining, Markham
- Retirement & Estate Planning, Markham
- Retirement Communities & Home, Assisted Living & Apartments, Markham
- Retirement Planning Consultants & Services, Markham
- Rigging Service & Crane Hoisting, Markham
- Road Construction, Markham - Companies & Contractors
- Road Construction & Repair Contractors, Markham
- Roadside Assistance, Road Service & Towing Service, Markham
- Robots & Robotics System, Markham
- Rods, Springs & Suspension Equipment & Supplies, Markham
- Roofing Consultants, Markham - Roofing Companies
- Roofing Contractors, Markham - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Markham
- Rubber Products, Markham
- Rubber Products - Retail, Markham
- Rubber Stamps, Markham
- Rust Preventives, Markham
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