- Radio & Television Repair Shops , Duncan - TV Repair
- Radio & Tv Communications Equipment Manufacturers, Duncan
- Radiologists, Duncan - Radiology Doctors, Physicians & Surgeons
- Railroad, Duncan - Commuter & Passenger Transport
- Ready Mix Concrete, Duncan - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Duncan
- Real Estate, Duncan - Agent, Broker & Companies
- Real Estate Listings Services, Duncan
- Real Estate Management, Duncan
- Real Estate Services, Duncan
- Record Storage, Destruction & Management, Duncan
- Recreational Equipment Repair & Service, Duncan
- Recycling Drop-Off Centers, Duncan
- Recycling Scrap & Waste Materials, Duncan - Scrap Metal, etc
- Refuse Collection & Disposal Services, Duncan
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- Religious Organizations, Duncan
- Repair Services, Duncan
- Residential, Duncan
- Residential Apartments, Duncan
- Residential Construction Contractors, Duncan - General Contractors
- Restaurant Equipment, Duncan
- Restaurant Equipment & Supplies, Duncan
- Restaurant Supplies & Equipment, Duncan
- Restaurants - Breakfast Brunch Lunch, Duncan
- Restaurants/Food & Dining, Duncan
- Robots & Robotics System, Duncan
- Roofing Consultants, Duncan - Roofing Companies
- Roofing Contractors, Duncan - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Ryder Truck Rental , Duncan - Ryder Moving
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