- Racing Including Track Operations, South Dennis
- Radio & Television Repair Shops , South Dennis - TV Repair
- Range & Oven Repair, Service & Sales, South Dennis
- Ready Mix Concrete, South Dennis - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, South Dennis
- Real Estate, South Dennis - Agent, Broker & Companies
- Real Estate Agent & Broker Services, South Dennis
- Real Estate Broker, South Dennis
- Real Estate Management, South Dennis
- Real Estate Services, South Dennis
- Recreational Equipment Repair & Service, South Dennis
- Recreational Services, South Dennis
- Rehabilitation Centers, Products & Services, South Dennis
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- Rehabilitation Specialists, South Dennis
- Religious Organizations, South Dennis
- Repair Services, South Dennis
- Research Film Laboratories & Film Services Motion Pictures, South Dennis
- Research Services, South Dennis
- Residential, South Dennis
- Residential Apartments, South Dennis
- Residential Construction Contractors, South Dennis - General Contractors
- Resorts & Hotels, South Dennis
- Resorts Time Share, South Dennis
- Restaurants/Food & Dining, South Dennis
- Rv Parks, South Dennis
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