- Radiator Coolant & Solvents, Wilmington - Engine Coolant
- Radiator Repair, Wilmington - Gas Tank Repair
- Radiator Repair & Rebuild, Wilmington
- Radio & Television Repair Shops , Wilmington - TV Repair
- Radiotelephone Communications, Wilmington
- Railroad, Wilmington - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Wilmington
- Railroad Contractors, Wilmington
- Railroad Services, Wilmington
- Real Estate, Wilmington - Agent, Broker & Companies
- Real Estate Developers, Wilmington
- Real Estate Management, Wilmington
- Real Estate Services, Wilmington
- Record Destruction Service, Wilmington
- Record Storage, Destruction & Management, Wilmington
- Records, Tapes, CDs - Used & Vintage, Wilmington
- Recreational Good Manufacturers, Wilmington
- Recycling Drop-Off Centers, Wilmington
- Recycling Scrap & Waste Materials, Wilmington - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Wilmington
- Refrigerated Storage & Warehouse, Wilmington - Warehousing
- Refrigeration & Cooling Equipment, Parts & Supplies , Wilmington - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Wilmington - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Wilmington
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- Refrigerator Sales, Service & Repair, Wilmington - Fridge
- Religious Education, Wilmington
- Religious Goods & Church Supplies Stores, Wilmington
- Religious Organizations, Wilmington
- Rental & Leasing Business Equipment, Wilmington
- Repair Services, Wilmington
- Research Services, Wilmington
- Residential, Wilmington
- Residential Apartments, Wilmington
- Residential Care Facilities, Wilmington
- Residential Landfills, Wilmington
- Restaurants - Breakfast Brunch Lunch, Wilmington
- Restaurants/Food & Dining, Wilmington
- Retail Book Stores, Wilmington
- Retirement Communities & Home, Assisted Living & Apartments, Wilmington
- Rigging Equipment & Supplies, Wilmington
- Rigging Service & Crane Hoisting, Wilmington
- Roadside Assistance, Road Service & Towing Service, Wilmington
- Roof Cleaning & Maintenance, Wilmington - Roofing Services
- Roofing & Siding Materials, Equipments & Supplies, Wilmington - Wholesale, Manufacturers & Suppliers
- Roofing Consultants, Wilmington - Roofing Companies
- Roofing Contractors, Wilmington - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Wilmington
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