- Radiator Repair, Ottawa - Gas Tank Repair
- Radio Stations & Broadcasting Companies, Ottawa
- Ready Mix Concrete, Ottawa - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Ottawa
- Real Estate, Ottawa - Agent, Broker & Companies
- Real Estate Inspectors, Ottawa - Real Estate Inspection Service
- Real Estate Management, Ottawa
- Real Estate Rentals, Ottawa
- Real Estate Services, Ottawa
- Records, Tapes, CDs - Used & Vintage, Ottawa
- Recreational Vehicles & Campers Rent & Lease, Ottawa
- Refrigeration & Cooling Equipment, Parts & Supplies , Ottawa - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Ottawa - Ac, Freezer, Refrigerator Repair
- Refuse Collection & Disposal Services, Ottawa
- Religious Education, Ottawa
- Religious Goods & Church Supplies Stores, Ottawa
- Religious Organizations, Ottawa
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- Rental & Leasing Business Equipment, Ottawa
- Rental Property Management, Ottawa
- Repair Services, Ottawa
- Residential, Ottawa
- Residential Apartments, Ottawa
- Residential Care Facilities, Ottawa
- Restaurant Management & Consulting, Ottawa - Food Facilities Consultants
- Restaurants/Food & Dining, Ottawa
- Retail Book Stores, Ottawa
- Retirement Communities & Home, Assisted Living & Apartments, Ottawa
- Roadside Assistance, Road Service & Towing Service, Ottawa
- Roofing Consultants, Ottawa - Roofing Companies
- Roofing Contractors, Ottawa - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV Parts, Accessories & Equipment, Ottawa - ATV & Recreation Vehicles
- RV Repair & Service, Ottawa - ATV & Recreation Vehicles
- Rvs Sales, Rental & Leasing, Ottawa
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