- Racing Including Track Operations, Ajax
- Radio & Television Repair Shops , Ajax - TV Repair
- Radio Stations & Broadcasting Companies, Ajax
- Railroad, Ajax - Commuter & Passenger Transport
- Ready Mix Concrete, Ajax - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Ajax
- Real Estate, Ajax - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Ajax
- Real Estate Agent - Property Lessors, Ajax
- Real Estate Appraiser, Ajax - Appraisal Services
- Real Estate Appraisers & Consulting Services, Ajax
- Real Estate Attorneys & Lawyers, Ajax
- Real Estate Attorneys & Lawyers, Ajax
- Real Estate Broker, Ajax
- Real Estate Consultants, Ajax
- Real Estate Developers, Ajax
- Real Estate Lawyers & Attorneys, Ajax
- Real Estate Management, Ajax
- Real Estate Properties, Ajax
- Real Estate Property Investment Properties, Ajax
- Real Estate Services, Ajax
- Recording Studio - Equipment & Rental, Ajax
- Recording Studio Service - Sound & Video, Ajax
- Records, Tapes, CDs - Used & Vintage, Ajax
- Recreational Equipment & Supplies Companies, Ajax
- Recreational Good Manufacturers, Ajax
- Recreational Services, Ajax
- Recycling Drop-Off Centers, Ajax
- Recycling Scrap & Waste Materials, Ajax - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Ajax
- Reflexologists, Ajax
- Refrigeration & Air Conditioning Contractors, Ajax - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Ajax - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Ajax - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Ajax
- Refrigerator Sales, Service & Repair, Ajax - Fridge
- Refuse Collection & Disposal Services, Ajax
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- Refuse Systems & Garbage Disposal, Ajax
- Rehabilitation Centers, Products & Services, Ajax
- Rehabilitation Specialists, Ajax
- Rehabilitational Job Training Services, Ajax
- Religious Education, Ajax
- Religious Organizations, Ajax
- Rental & Leasing Business Equipment, Ajax
- Repair Services, Ajax
- Research Services, Ajax
- Residential, Ajax
- Residential Apartments, Ajax
- Residential Architect, Ajax
- Residential Care Facilities, Ajax
- Residential Construction Contractors, Ajax - General Contractors
- Restaurant & Food Service Management Services, Ajax
- Restaurant & Lounge, Bar, Or Pub, Ajax
- Restaurant Equipment, Ajax
- Restaurant Equipment & Supplies, Ajax
- Restaurant Equipment Repair & Service, Ajax - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Supplies & Equipment, Ajax
- Restaurants/Food & Dining, Ajax
- Retirement Communities & Home, Assisted Living & Apartments, Ajax
- Reweavers Garment Services, Ajax
- Riding Apparel & Equipment, Ajax
- Road Construction Equipment & Machinery, Ajax
- Roadside Assistance, Road Service & Towing Service, Ajax
- Robots & Robotics System, Ajax
- Rodeo & Equestrian Equipment & Supplies, Ajax
- Rods, Springs & Suspension Equipment & Supplies, Ajax
- Roofing Consultants, Ajax - Roofing Companies
- Roofing Contractors, Ajax - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Ajax
- Rubber Products, Ajax
- Rubber Stamps, Ajax
- Rust Preventives, Ajax
- Ryder Truck Rental , Ajax - Ryder Moving
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