- Radio & Television Repair Shops , Douglas - TV Repair
- Radio Equipment & Parts Stores & Dealers, Douglas
- Radio Stations & Broadcasting Companies, Douglas
- Ready Mix Concrete, Douglas - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Douglas
- Real Estate, Douglas - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Douglas
- Real Estate Services, Douglas
- Refrigerator & Freezer Equipment, Parts & Supplies, Douglas
- Rehabilitation Centers, Products & Services, Douglas
- Rehabilitation Specialists, Douglas
- Rehabilitational Job Training Services, Douglas
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- Religious Education, Douglas
- Religious Organizations, Douglas
- Repair Services, Douglas
- Research Services, Douglas
- Residential, Douglas
- Residential Apartments, Douglas
- Residential Care Facilities, Douglas
- Restaurants/Food & Dining, Douglas
- Riding Equipment, Douglas
- Rodeo & Equestrian Equipment & Supplies, Douglas
- Roofing Materials & Supplies, Douglas
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