- Racing Including Track Operations, Sudbury
- Radiator Coolant & Solvents, Sudbury - Engine Coolant
- Radio & Television Repair Shops , Sudbury - TV Repair
- Radio Communications Equipment & Systems , Sudbury
- Radio Stations & Broadcasting Companies, Sudbury
- Radiology Equipment & Services, Sudbury - X-Ray Equipment & Supplies
- Radiotelephone Communications, Sudbury
- Railroad Companies, Sudbury
- Railroad Services, Sudbury
- Reading Instruction Schools, Sudbury
- Ready Mix Concrete, Sudbury - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Sudbury
- Real Estate, Sudbury - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Sudbury
- Real Estate Agent - Property Lessors, Sudbury
- Real Estate Appraiser, Sudbury - Appraisal Services
- Real Estate Appraisers & Consulting Services, Sudbury
- Real Estate Broker, Sudbury
- Real Estate Consultants, Sudbury
- Real Estate Developers, Sudbury
- Real Estate Management, Sudbury
- Real Estate Services, Sudbury
- Real Estate Staging Service, Sudbury
- Record Storage, Destruction & Management, Sudbury
- Recording Studio - Equipment & Rental, Sudbury
- Records, Tapes, CDs - Used & Vintage, Sudbury
- Recreational Equipment & Supplies Companies, Sudbury
- Recreational Organizations, Sudbury
- Recreational Services, Sudbury
- Recycling Drop-Off Centers, Sudbury
- Recycling Scrap & Waste Materials, Sudbury - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Sudbury
- Reflexologists, Sudbury
- Refrigerated Beverage Dispenser, Sudbury - Water Coolers Equipment & Supplies
- Refrigerated Storage & Warehouse, Sudbury - Warehousing
- Refrigeration & Air Conditioning Contractors, Sudbury - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Sudbury - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Sudbury - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Sudbury - Fridge
- Refuse Collection & Disposal Services, Sudbury
- Refuse Systems & Garbage Disposal, Sudbury
- Registered Retirement Savings Plan, Sudbury
- Rehabilitation Centers, Products & Services, Sudbury
- Rehabilitation Specialists, Sudbury
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- Rehabilitational Job Training Services, Sudbury
- Religious Organizations, Sudbury
- Rental & Leasing Business Equipment, Sudbury
- Repair Services, Sudbury
- Research & Development Bureaus, Sudbury - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Sudbury - Laboratories
- Research Services, Sudbury
- Residential, Sudbury
- Residential Apartments, Sudbury
- Residential Architect, Sudbury
- Residential Care Facilities, Sudbury
- Residential Construction Contractors, Sudbury - General Contractors
- Residential Electricians, Sudbury - Electric Contractors
- Resorts & Hotels, Sudbury
- Restaurant & Food Service Management Services, Sudbury
- Restaurant & Lounge, Bar, Or Pub, Sudbury
- Restaurant Equipment, Sudbury
- Restaurant Equipment & Supplies, Sudbury
- Restaurant Equipment Repair & Service, Sudbury - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Supplies & Equipment, Sudbury
- Restaurants/Food & Dining, Sudbury
- Resume Service, Sudbury
- Retail Book Stores, Sudbury
- Retaining Wall Contractors, Sudbury - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement & Estate Planning, Sudbury
- Retirement Communities & Home, Assisted Living & Apartments, Sudbury
- Retirement Homes, Sudbury
- Retirement Planning Consultants & Services, Sudbury
- Retreat Facilities & Houses, Sudbury
- Riding & Rodeo Services, Sudbury
- Riding Apparel & Equipment, Sudbury
- Rigging Service & Crane Hoisting, Sudbury
- Road Construction, Sudbury - Companies & Contractors
- Road Construction & Repair Contractors, Sudbury
- Rods, Springs & Suspension Equipment & Supplies, Sudbury
- Roofing Consultants, Sudbury - Roofing Companies
- Roofing Contractors, Sudbury - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Sudbury
- Rooming & Boarding Houses, Sudbury
- Rubber Products, Sudbury
- Rubber Products - Retail, Sudbury
- Rubber Stamps, Sudbury
- Ryder Truck Rental , Sudbury - Ryder Moving
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