- Racing Car Supplies, Oakville
- Racks Industrial, Oakville
- Radiation Detection Services, Oakville
- Radiator Coolant & Solvents, Oakville - Engine Coolant
- Radiator Repair, Oakville - Gas Tank Repair
- Radio & Television Repair Shops , Oakville - TV Repair
- Radio Stations & Broadcasting Companies, Oakville
- Radiology Equipment & Services, Oakville - X-Ray Equipment & Supplies
- Radiotelephone Communications, Oakville
- Railroad, Oakville - Commuter & Passenger Transport
- Ready Mix Concrete, Oakville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Oakville
- Real Estate, Oakville - Agent, Broker & Companies
- Real Estate Agencies, Oakville
- Real Estate Agent & Broker Services, Oakville
- Real Estate Agent - Property Lessors, Oakville
- Real Estate Appraiser, Oakville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Oakville
- Real Estate Attorneys & Lawyers, Oakville
- Real Estate Attorneys & Lawyers, Oakville
- Real Estate Broker, Oakville
- Real Estate Consultants, Oakville
- Real Estate Developers, Oakville
- Real Estate Lawyers & Attorneys, Oakville
- Real Estate Management, Oakville
- Real Estate Properties, Oakville
- Real Estate Property Investment Properties, Oakville
- Real Estate Services, Oakville
- Record Storage, Destruction & Management, Oakville
- Recording Studio - Equipment & Rental, Oakville
- Records, Tapes, CDs - Used & Vintage, Oakville
- Recreational Equipment & Supplies Companies, Oakville
- Recreational Good Manufacturers, Oakville
- Recreational Organizations, Oakville
- Recreational Services, Oakville
- Recycling Drop-Off Centers, Oakville
- Recycling Scrap & Waste Materials, Oakville - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Oakville
- Reflexologists, Oakville
- Refrigeration & Air Conditioning Contractors, Oakville - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Oakville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigerator Sales, Service & Repair, Oakville - Fridge
- Refuse Collection & Disposal, Oakville
- Refuse Collection & Disposal Services, Oakville
- Refuse Systems & Garbage Disposal, Oakville
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- Rehabilitation Centers, Oakville
- Rehabilitation Centers, Products & Services, Oakville
- Rehabilitation Specialists, Oakville
- Rehabilitational Job Training Services, Oakville
- Religious Education, Oakville
- Religious Organizations, Oakville
- Relocation Services, Oakville
- Rental & Leasing Business Equipment, Oakville
- Repair Services, Oakville
- Research & Development Bureaus, Oakville - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Oakville - Laboratories
- Research Services, Oakville
- Residential, Oakville
- Residential Apartments, Oakville
- Residential Architect, Oakville
- Residential Care Facilities, Oakville
- Residential Construction Contractors, Oakville - General Contractors
- Residential Lighting Fixtures Manufacturers, Oakville
- Resorts & Hotels, Oakville
- Restaurant & Food Service Management Services, Oakville
- Restaurant & Lounge, Bar, Or Pub, Oakville
- Restaurant Equipment, Oakville
- Restaurant Equipment & Supplies, Oakville
- Restaurant Equipment Repair & Service, Oakville - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Supplies & Equipment, Oakville
- Restaurants - Breakfast Brunch Lunch, Oakville
- Restaurants/Food & Dining, Oakville
- Retail Book Stores, Oakville
- Retaining Wall Contractors, Oakville - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement & Estate Planning, Oakville
- Retirement Communities & Home, Assisted Living & Apartments, Oakville
- Retirement Planning Consultants & Services, Oakville
- Riding & Rodeo Services, Oakville
- Rifle & Pistol Ranges, Oakville
- Road Construction, Oakville - Companies & Contractors
- Road Construction & Repair Contractors, Oakville
- Roadside Assistance, Road Service & Towing Service, Oakville
- Rods, Springs & Suspension Equipment & Supplies, Oakville
- Roofing Consultants, Oakville - Roofing Companies
- Roofing Contractors, Oakville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Oakville
- Rubber & Plastic Products, Oakville
- Rubber Products - Manufacturers, Oakville
- Ryder Truck Rental , Oakville - Ryder Moving
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