- Racing Including Track Operations, Londonderry
- Radio Communications Equipment & Systems , Londonderry
- Ready Mix Concrete, Londonderry - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Londonderry
- Real Estate, Londonderry - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Londonderry
- Real Estate Agent - Property Lessors, Londonderry
- Real Estate Appraiser, Londonderry - Appraisal Services
- Real Estate Appraisers & Consulting Services, Londonderry
- Real Estate Broker, Londonderry
- Real Estate Developers, Londonderry
- Real Estate Management, Londonderry
- Real Estate Services, Londonderry
- Recycling Drop-Off Centers, Londonderry
- Recycling Scrap & Waste Materials, Londonderry - Scrap Metal, etc
- Refrigerated Storage & Warehouse, Londonderry - Warehousing
- Refrigerated Truck, Londonderry
- Refuse Collection & Disposal, Londonderry
- Refuse Systems & Garbage Disposal, Londonderry
- Rehabilitation Centers, Products & Services, Londonderry
- Rehabilitation Specialists, Londonderry
- Religious Organizations, Londonderry
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- Repair Services, Londonderry
- Repossession Services, Londonderry
- Research & Development Bureaus, Londonderry - Commercial, Economic, Sociological & Educational Research
- Research Services, Londonderry
- Residential, Londonderry
- Residential Apartments, Londonderry
- Restaurant & Food Service Management Services, Londonderry
- Restaurant Equipment, Londonderry
- Restaurant Equipment & Supplies, Londonderry
- Restaurant Equipment Repair & Service, Londonderry - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Supplies & Equipment, Londonderry
- Restaurants/Food & Dining, Londonderry
- Retirement & Estate Planning, Londonderry
- Retirement Planning Consultants & Services, Londonderry
- Riding & Rodeo Services, Londonderry
- Rigging Service & Crane Hoisting, Londonderry
- Road Construction, Londonderry - Companies & Contractors
- Roast Beef Restaurants, Londonderry
- Rods, Springs & Suspension Equipment & Supplies, Londonderry
- Roofing Consultants, Londonderry - Roofing Companies
- Roofing Contractors, Londonderry - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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