- Radiation Physics Services, Dover
- Real Estate, Dover - Agent, Broker & Companies
- Real Estate Services, Dover
- Recycling Scrap & Waste Materials, Dover - Scrap Metal, etc
- Religious Organizations, Dover
- Repair Services, Dover
- Research & Development Bureaus, Dover - Commercial, Economic, Sociological & Educational Research
- Research Services, Dover
- Residential, Dover
- Residential Apartments, Dover
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- Residential Construction Contractors, Dover - General Contractors
- Restaurants/Food & Dining, Dover
- Riding & Rodeo Services, Dover
- Roofing Consultants, Dover - Roofing Companies
- Roofing Contractors, Dover - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Dover
- RV & Campers Repair & Service, Dover
- Rv Parks, Dover
- RV Repair, Dover - Recreational Vehicle
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