- Racing Car Supplies, Guelph
- Radio & Television Repair Shops , Guelph - TV Repair
- Radio Communications Equipment & Systems , Guelph
- Radio Stations & Broadcast Companies, Guelph - Radio, Television & Publishers Representatives
- Radio Stations & Broadcasting Companies, Guelph
- Radiotelephone Communications, Guelph
- Railroad & Subway Construction Contractors, Guelph
- Railroad Companies, Guelph
- Railroad Contractors, Guelph
- Ready Mix Concrete, Guelph - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Guelph
- Real Estate, Guelph - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Guelph
- Real Estate Agent - Property Lessors, Guelph
- Real Estate Appraiser, Guelph - Appraisal Services
- Real Estate Appraisers & Consulting Services, Guelph
- Real Estate Attorneys & Lawyers, Guelph
- Real Estate Attorneys & Lawyers, Guelph
- Real Estate Broker, Guelph
- Real Estate Consultants, Guelph
- Real Estate Developers, Guelph
- Real Estate Lawyers & Attorneys, Guelph
- Real Estate Management, Guelph
- Real Estate Properties, Guelph
- Real Estate Property Investment Properties, Guelph
- Real Estate Rentals, Guelph
- Real Estate Services, Guelph
- Real Estate Staging Service, Guelph
- Record Storage, Destruction & Management, Guelph
- Recording Studio - Equipment & Rental, Guelph
- Records, Tapes, CDs - Used & Vintage, Guelph
- Recreational Good Manufacturers, Guelph
- Recreational Services, Guelph
- Recycling Scrap & Waste Materials, Guelph - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Guelph
- Reflexologists, Guelph
- Reformed Churches, Guelph
- Refrigeration & Air Conditioning Contractors, Guelph - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Guelph - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Guelph - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Guelph - Fridge
- Refuse Collection & Disposal, Guelph
- Refuse Collection & Disposal Services, Guelph
- Refuse Systems & Garbage Disposal, Guelph
- Rehabilitation Centers, Products & Services, Guelph
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- Rehabilitation Specialists, Guelph
- Rehabilitational Job Training Services, Guelph
- Religious Education, Guelph
- Religious Goods & Church Supplies Stores, Guelph
- Religious Organizations, Guelph
- Rental & Leasing Business Equipment, Guelph
- Repair Services, Guelph
- Reprographic Services, Guelph
- Research & Development Bureaus, Guelph - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Guelph - Laboratories
- Research Service Libraries, Guelph
- Research Services, Guelph
- Residential, Guelph
- Residential Apartments, Guelph
- Residential Architect, Guelph
- Residential Care Facilities, Guelph
- Residential Construction Contractors, Guelph - General Contractors
- Residential Electricians, Guelph - Electric Contractors
- Restaurant & Food Service Management Services, Guelph
- Restaurant & Lounge, Bar, Or Pub, Guelph
- Restaurant Equipment, Guelph
- Restaurant Equipment & Supplies, Guelph
- Restaurant Management & Consulting, Guelph - Food Facilities Consultants
- Restaurant Supplies & Equipment, Guelph
- Restaurants - Breakfast Brunch Lunch, Guelph
- Restaurants/Food & Dining, Guelph
- Resume Service, Guelph
- Retail Book Stores, Guelph
- Retirement & Estate Planning, Guelph
- Retirement Communities & Home, Assisted Living & Apartments, Guelph
- Retirement Homes, Guelph
- Retirement Planning Consultants & Services, Guelph
- Riding & Rodeo Services, Guelph
- Road Construction, Guelph - Companies & Contractors
- Road Construction & Repair Contractors, Guelph
- Road Construction Equipment & Machinery, Guelph
- Roadside Assistance, Road Service & Towing Service, Guelph
- Rods, Springs & Suspension Equipment & Supplies, Guelph
- Roofing Consultants, Guelph - Roofing Companies
- Roofing Contractors, Guelph - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Guelph
- Rubber Products, Guelph
- Rubber Products - Retail, Guelph
- Rubber Stamps, Guelph
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