- Radiator Repair, Douglas - Gas Tank Repair
- Radiator Repair & Rebuild, Douglas
- Radio Stations & Broadcasting Companies, Douglas
- Radiologists, Douglas - Radiology Doctors, Physicians & Surgeons
- Radiotelephone Communications, Douglas
- Railroad Services, 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 Appraiser, Douglas - Appraisal Services
- Real Estate Appraisers & Consulting Services, Douglas
- Real Estate Attorneys & Lawyers, Douglas
- Real Estate Lawyers & Attorneys, Douglas
- Real Estate Services, Douglas
- Recreational Equipment & Supplies Companies, Douglas
- Recycling Drop-Off Centers, Douglas
- Recycling Scrap & Waste Materials, Douglas - Scrap Metal, etc
- Refrigerated Storage & Warehouse, Douglas - Warehousing
- Refrigeration & Cooling Equipment, Parts & Supplies , Douglas - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Douglas - Ac, Freezer, Refrigerator Repair
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- Refuse Collection & Disposal Services, Douglas
- Refuse Systems & Garbage Disposal, Douglas
- Rehabilitation Centers, Products & Services, Douglas
- Rehabilitation Specialists, Douglas
- Religious Goods & Church Supplies Stores, Douglas
- Religious Organizations, Douglas
- Religious Practitioners, Douglas
- Rental & Leasing Business Equipment, Douglas
- Repair Services, Douglas
- Residential, Douglas
- Residential Apartments, Douglas
- Residential Care Facilities, Douglas
- Residential Construction Contractors, Douglas - General Contractors
- Respiratory Medical Services, Douglas
- Respiratory Therapy, Douglas
- Restaurants/Food & Dining, Douglas
- Restoration Contractors, Douglas
- Roadside Assistance, Road Service & Towing Service, Douglas
- Roofing Consultants, Douglas - Roofing Companies
- Roofing Contractors, Douglas - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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