- Radiator Repair, Ottawa - Gas Tank Repair
- Radiator Repair & Rebuild, Ottawa
- Radio & Television Repair Shops , Ottawa - TV Repair
- Radio Equipment & Parts Stores & Dealers, Ottawa
- Radio Stations & Broadcasting Companies, Ottawa
- Railroad & Subway Construction Contractors, Ottawa
- Railroad Companies, Ottawa
- Railroad Contractors, Ottawa
- Ready Mix Concrete, Ottawa - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Ottawa
- Real Estate, Ottawa - Agent, Broker & Companies
- Real Estate Appraiser, Ottawa - Appraisal Services
- Real Estate Appraisers & Consulting Services, Ottawa
- Real Estate Attorneys & Lawyers, Ottawa
- Real Estate Lawyers & Attorneys, Ottawa
- Real Estate Services, Ottawa
- Records, Tapes, CDs - Used & Vintage, Ottawa
- Recreational Equipment & Supplies Companies, Ottawa
- Recycling Drop-Off Centers, Ottawa
- Recycling Scrap & Waste Materials, Ottawa - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Ottawa
- Refrigerated Storage & Warehouse, Ottawa - Warehousing
- Rehabilitation Centers, Products & Services, Ottawa
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- Rehabilitation Specialists, Ottawa
- Rehabilitational Job Training Services, Ottawa
- Religious Organizations, Ottawa
- Repair Services, Ottawa
- Research & Development Bureaus, Ottawa - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Ottawa - Laboratories
- Research Services, Ottawa
- Residential, Ottawa
- Residential Apartments, Ottawa
- Residential Care Facilities, Ottawa
- Residential Construction Contractors, Ottawa - General Contractors
- Residential Landfills, Ottawa
- Restaurant & Lounge, Bar, Or Pub, Ottawa
- Restaurant Equipment, Ottawa
- Restaurant Equipment & Supplies, Ottawa
- Restaurant Supplies & Equipment, Ottawa
- Restaurants/Food & Dining, Ottawa
- Retail Book Stores, Ottawa
- Retirement Communities & Home, Assisted Living & Apartments, Ottawa
- Rigging Service & Crane Hoisting, Ottawa
- Roadside Assistance, Road Service & Towing Service, Ottawa
- Roofing Consultants, Ottawa - Roofing Companies
- Roofing Contractors, Ottawa - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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