- Racing Car Supplies, Wilmington
- Radiator Coolant & Solvents, Wilmington - Engine Coolant
- Radiator Repair, Wilmington - Gas Tank Repair
- Radiator Repair & Rebuild, Wilmington
- Radiologists, Wilmington - Radiology Doctors, Physicians & Surgeons
- Ready Mix Concrete, Wilmington - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Wilmington
- Real Estate, Wilmington - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Wilmington
- Real Estate Appraiser, Wilmington - Appraisal Services
- Real Estate Appraisers & Consulting Services, Wilmington
- Real Estate Consultants, Wilmington
- Real Estate Developers, Wilmington
- Real Estate Farms & Ranches, Wilmington
- Real Estate Management, Wilmington
- Real Estate Properties, Wilmington
- Real Estate Property Investment Properties, Wilmington
- Real Estate Services, Wilmington
- Recreational Organizations, Wilmington
- Recreational Services, Wilmington
- Recycling Drop-Off Centers, Wilmington
- Recycling Scrap & Waste Materials, Wilmington - Scrap Metal, etc
- Refrigerated Truck, Wilmington
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- Refuse Collection & Disposal Services, Wilmington
- Rehabilitation Centers, Products & Services, Wilmington
- Rehabilitation Specialists, Wilmington
- Rehabilitational Job Training Services, Wilmington
- Relief Organizations, Wilmington
- Religious Organizations, Wilmington
- Religious Practitioners, Wilmington
- Rental & Leasing Business Equipment, Wilmington
- Repair Services, Wilmington
- Research Services, Wilmington
- Residential, Wilmington
- Residential Apartments, Wilmington
- Residential Construction Contractors, Wilmington - General Contractors
- Resorts & Hotels, Wilmington
- Restaurant & Food Service Management Services, Wilmington
- Restaurants/Food & Dining, Wilmington
- Retail Book Stores, Wilmington
- Retirement Communities & Home, Assisted Living & Apartments, Wilmington
- Road Construction, Wilmington - Companies & Contractors
- Roofing Consultants, Wilmington - Roofing Companies
- Roofing Contractors, Wilmington - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rooming & Boarding Houses, Wilmington
- Rv Parks, Wilmington
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