- Ready Mix Concrete, Darlington - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Darlington
- Real Estate, Darlington - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Darlington
- Real Estate Services, Darlington
- Recycling Scrap & Waste Materials, Darlington - Scrap Metal, etc
- Refrigerated Storage & Warehouse, Darlington - Warehousing
- Refuse Systems & Garbage Disposal, Darlington
- Relief Organizations, Darlington
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- Religious Education, Darlington
- Religious Organizations, Darlington
- Repair Services, Darlington
- Research & Development Bureaus, Darlington - Commercial, Economic, Sociological & Educational Research
- Research Services, Darlington
- Residential Care Facilities, Darlington
- Residential Construction Contractors, Darlington - General Contractors
- Restaurants/Food & Dining, Darlington
- Retirement Communities & Home, Assisted Living & Apartments, Darlington
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