- Racing Including Track Operations, Darlington
- Radiator Coolant & Solvents, Darlington - Engine Coolant
- Radio & Tv Communications Equipment Manufacturers, Darlington
- Railroad & Subway Construction Contractors, Darlington
- Railroad Contractors, Darlington
- Railroad Services, Darlington
- Real Estate, Darlington - Agent, Broker & Companies
- Real Estate Appraiser, Darlington - Appraisal Services
- Real Estate Appraisers & Consulting Services, Darlington
- Real Estate Developers, Darlington
- Real Estate Management, Darlington
- Real Estate Services, Darlington
- Recycling Drop-Off Centers, Darlington
- Recycling Scrap & Waste Materials, Darlington - Scrap Metal, etc
- Refuse Collection & Disposal Services, Darlington
- Refuse Systems & Garbage Disposal, Darlington
- Religious Education, Darlington
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- Religious Organizations, Darlington
- Rental Property Management, Darlington
- Repair Services, Darlington
- Residential, Darlington
- Residential Apartments, Darlington
- Residential Care Facilities, Darlington
- Residential Construction Contractors, Darlington - General Contractors
- Residential Real Estate - Rental & Leasing, Darlington
- Restaurants - Breakfast Brunch Lunch, Darlington
- Restaurants/Food & Dining, Darlington
- Retirement Communities & Home, Assisted Living & Apartments, Darlington
- Rice Products, Darlington
- Robots & Robotics System, Darlington
- Roofing Consultants, Darlington - Roofing Companies
- Roofing Contractors, Darlington - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rooming & Boarding Houses, Darlington
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