- Racing Car Supplies, Dover
- Radiology Equipment & Services, Dover - X-Ray Equipment & Supplies
- Real Estate, Dover - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Dover
- Real Estate Appraiser, Dover - Appraisal Services
- Real Estate Appraisers & Consulting Services, Dover
- Real Estate Broker, Dover
- Real Estate Management, Dover
- Real Estate Services, Dover
- Recording Studio - Equipment & Rental, Dover
- Recreational Good Manufacturers, Dover
- Recycling Drop-Off Centers, Dover
- Recycling Scrap & Waste Materials, Dover - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Dover
- Refrigeration & Cooling Equipment, Parts & Supplies , Dover - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Dover - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Dover - Fridge
- Rehabilitation Centers, Products & Services, Dover
- Rehabilitation Specialists, Dover
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- Rehabilitational Job Training Services, Dover
- Religious Organizations, Dover
- Religious Services, Dover
- Rental & Leasing Business Equipment, Dover
- Repair Services, Dover
- Research & Development Bureaus, Dover - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Dover - Laboratories
- Research Services, Dover
- Residential, Dover
- Residential Apartments, Dover
- Residential Construction Contractors, Dover - General Contractors
- Restaurants/Food & Dining, Dover
- Retail Book Stores, Dover
- Rheumatologists, Dover - Rheumatology Doctors, Physicians & Surgeons
- Rigging Equipment & Supplies, Dover
- Roofing Consultants, Dover - Roofing Companies
- Roofing Contractors, Dover - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Dover
- Rooming & Boarding Houses, Dover
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