- Race Track Equipment & Supplies, Summerside
- Racing Including Track Operations, Summerside
- Radiator Coolant & Solvents, Summerside - Engine Coolant
- Radio Stations & Broadcasting Companies, Summerside
- Railroad, Summerside - Commuter & Passenger Transport
- Ready Mix Concrete, Summerside - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Summerside
- Real Estate, Summerside - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Summerside
- Real Estate Appraisers & Consulting Services, Summerside
- Real Estate Attorneys & Lawyers, Summerside
- Real Estate Attorneys & Lawyers, Summerside
- Real Estate Broker, Summerside
- Real Estate Consultants, Summerside
- Real Estate Developers, Summerside
- Real Estate Lawyers & Attorneys, Summerside
- Real Estate Management, Summerside
- Real Estate Services, Summerside
- Record Storage, Destruction & Management, Summerside
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- Recreational Services, Summerside
- Recycling Drop-Off Centers, Summerside
- Recycling Scrap & Waste Materials, Summerside - Scrap Metal, etc
- Refuse Collection & Disposal Services, Summerside
- Religious Goods & Church Supplies Stores, Summerside
- Religious Organizations, Summerside
- Rental & Leasing Business Equipment, Summerside
- Repair Services, Summerside
- Research Services, Summerside
- Residential, Summerside
- Residential Apartments, Summerside
- Restaurant Equipment & Supplies, Summerside
- Restaurant Lobster, Summerside
- Restaurants/Food & Dining, Summerside
- Retail Book Stores, Summerside
- Roofing Consultants, Summerside - Roofing Companies
- Roofing Contractors, Summerside - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Summerside
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