- Radiator Coolant & Solvents, Dover - Engine Coolant
- Radio Stations & Broadcasting Companies, Dover
- Radon Testing & Services, Dover
- Real Estate, Dover - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Dover
- Real Estate Agent - Property Lessors, Dover
- Real Estate Appraiser, Dover - Appraisal Services
- Real Estate Appraisers & Consulting Services, Dover
- Real Estate Attorneys & Lawyers, Dover
- Real Estate Broker, Dover
- Real Estate Consultants, Dover
- Real Estate Developers, Dover
- Real Estate Management, Dover
- Real Estate Services, Dover
- Record Labels, Dover - Record Companies
- Record Storage, Destruction & Management, Dover
- Records, Tapes, CDs - Used & Vintage, Dover
- Reducing Exercise & Weight Control Services, Dover
- Refuse Collection & Disposal Services, Dover
- Refuse Systems & Garbage Disposal, Dover
- Rehabilitation Centers, Products & Services, Dover
- Rehabilitation Specialists, Dover
- Relief Organizations, Dover
- Religious Organizations, Dover
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- Repair Services, Dover
- Research & Development Bureaus, Dover - Commercial, Economic, Sociological & Educational Research
- Research Services, Dover
- Residential, Dover
- Residential Apartments, Dover
- Residential Construction Contractors, Dover - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Dover
- Restaurant Equipment Repair & Service, Dover - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants/Food & Dining, Dover
- Restoration Church, Dover
- Resume Service, Dover
- Retirement & Estate Planning, Dover
- Retirement Communities & Home, Assisted Living & Apartments, Dover
- Retirement Planning Consultants & Services, Dover
- Riding & Rodeo Services, Dover
- Rigging Equipment & Supplies, Dover
- Rigging Service & Crane Hoisting, Dover
- Roadside Assistance, Road Service & Towing Service, Dover
- Rolls Rubber Covered, Dover
- Roofing Consultants, Dover - Roofing Companies
- Roofing Contractors, Dover - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products - Manufacturers, Dover
- Rubber Rolls & Roll Coverings, Dover
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