- Racing Including Track Operations, Brockville
- Radiator Coolant & Solvents, Brockville - Engine Coolant
- Radiator Repair, Brockville - Gas Tank Repair
- Radio & Television Repair Shops , Brockville - TV Repair
- Radio Stations & Broadcast Companies, Brockville - Radio, Television & Publishers Representatives
- Radio Stations & Broadcasting Companies, Brockville
- Radiotelephone Communications, Brockville
- Railroad, Brockville - Commuter & Passenger Transport
- Ready Mix Concrete, Brockville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Brockville
- Real Estate, Brockville - Agent, Broker & Companies
- Real Estate Agencies, Brockville
- Real Estate Agent & Broker Services, Brockville
- Real Estate Agent - Property Lessors, Brockville
- Real Estate Appraiser, Brockville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Brockville
- Real Estate Broker, Brockville
- Real Estate Developers, Brockville
- Real Estate Management, Brockville
- Real Estate Properties, Brockville
- Real Estate Property Investment Properties, Brockville
- Real Estate Rentals, Brockville
- Real Estate Services, Brockville
- Record Storage, Destruction & Management, Brockville
- Recycling Drop-Off Centers, Brockville
- Recycling Scrap & Waste Materials, Brockville - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Brockville
- Reformed Churches, Brockville
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- Refrigeration & Air Conditioning Contractors, Brockville - Installation, Repair, Sales & Service
- Refrigerator Sales, Service & Repair, Brockville - Fridge
- Refuse Collection & Disposal Services, Brockville
- Refuse Systems & Garbage Disposal, Brockville
- Rehabilitational Job Training Services, Brockville
- Religious Organizations, Brockville
- Rental & Leasing Business Equipment, Brockville
- Repair Services, Brockville
- Research Services, Brockville
- Residential, Brockville
- Residential Apartments, Brockville
- Residential Architect, Brockville
- Residential Care Facilities, Brockville
- Residential Construction Contractors, Brockville - General Contractors
- Residential Landfills, Brockville
- Restaurant Equipment, Brockville
- Restaurant Equipment & Supplies, Brockville
- Restaurant Equipment Repair & Service, Brockville - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Supplies & Equipment, Brockville
- Restaurants/Food & Dining, Brockville
- Retail Book Stores, Brockville
- Retirement Communities & Home, Assisted Living & Apartments, Brockville
- Road Construction, Brockville - Companies & Contractors
- Road Construction & Repair Contractors, Brockville
- Roofing Consultants, Brockville - Roofing Companies
- Roofing Contractors, Brockville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Brockville
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