- Racing Car Supplies, Bolton
- Radio Stations & Broadcasting Companies, Bolton
- Ready Mix Concrete, Bolton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Bolton
- Real Estate, Bolton - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Bolton
- Real Estate Agent - Property Lessors, Bolton
- Real Estate Appraiser, Bolton - Appraisal Services
- Real Estate Appraisers & Consulting Services, Bolton
- Real Estate Broker, Bolton
- Real Estate Developers, Bolton
- Real Estate Management, Bolton
- Real Estate Services, Bolton
- Real Estate Staging Service, Bolton
- Recycling Scrap & Waste Materials, Bolton - Scrap Metal, etc
- Refrigeration & Air Conditioning Contractors, Bolton - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Bolton - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigerator Sales, Service & Repair, Bolton - Fridge
- Refuse Collection & Disposal Services, Bolton
- Refuse Systems & Garbage Disposal, Bolton
- Rehabilitation Centers, Products & Services, Bolton
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- Rehabilitation Specialists, Bolton
- Rehabilitational Job Training Services, Bolton
- Religious Organizations, Bolton
- Repair Services, Bolton
- Reprographic Services, Bolton
- Research & Development Labs, Bolton - Laboratories
- Research Services, Bolton
- Residential, Bolton
- Residential Care Facilities, Bolton
- Restaurant Equipment & Supplies, Bolton
- Restaurants/Food & Dining, Bolton
- Retail Book Stores, Bolton
- Retaining Wall Contractors, Bolton - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement Communities & Home, Assisted Living & Apartments, Bolton
- Rheem / Rudd Heating & Air Conditioning Contractors, Bolton - Air Conditioner Contractors & Systems
- Riding & Rodeo Services, Bolton
- Rigging Service & Crane Hoisting, Bolton
- Rods, Springs & Suspension Equipment & Supplies, Bolton
- Roofing Contractors, Bolton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Ryder Truck Rental , Bolton - Ryder Moving
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