- Racing Car Supplies, Concord
- Racing Including Track Operations, Concord
- Radiation Detection Services, Concord
- Radiator Coolant & Solvents, Concord - Engine Coolant
- Radio & Television Repair Shops , Concord - TV Repair
- Radio Communications Equipment & Systems , Concord
- Radio Stations & Broadcast Companies, Concord - Radio, Television & Publishers Representatives
- Radiotelephone Communications, Concord
- Railroad & Subway Construction Contractors, Concord
- Railroad Contractors, Concord
- Railroad Services, Concord
- Ready Mix Concrete, Concord - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Concord
- Real Estate, Concord - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Concord
- Real Estate Agent - Property Lessors, Concord
- Real Estate Broker, Concord
- Real Estate Developers, Concord
- Real Estate Management, Concord
- Real Estate Services, Concord
- Recording Studio - Equipment & Rental, Concord
- Records, Tapes, CDs - Used & Vintage, Concord
- Recreational Good Manufacturers, Concord
- Recycling Drop-Off Centers, Concord
- Recycling Scrap & Waste Materials, Concord - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Concord
- Refrigerated Beverage Dispenser, Concord - Water Coolers Equipment & Supplies
- Refrigerated Storage & Warehouse, Concord - Warehousing
- Refrigeration & Air Conditioning Contractors, Concord - Installation, Repair, Sales & Service
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- Refrigeration & Cooling Equipment, Parts & Supplies , Concord - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Concord - Ac, Freezer, Refrigerator Repair
- Refuse Collection & Disposal Services, Concord
- Rehabilitational Job Training Services, Concord
- Religious Goods & Church Supplies Stores, Concord
- Religious Organizations, Concord
- Rental & Leasing Business Equipment, Concord
- Repair Services, Concord
- Research Services, Concord
- Residential Construction Contractors, Concord - General Contractors
- Residential Electricians, Concord - Electric Contractors
- Residential Landfills, Concord
- Restaurant & Food Service Management Services, Concord
- Restaurant Equipment, Concord
- Restaurant Equipment & Supplies, Concord
- Restaurant Supplies & Equipment, Concord
- Restaurants/Food & Dining, Concord
- Retaining Wall Contractors, Concord - Build & Repair - Blocks, Concrete, Stones, etc
- Risk Management Consultants, Concord
- Road Construction, Concord - Companies & Contractors
- Road Construction & Repair Contractors, Concord
- Robots & Robotics System, Concord
- Roofing & Siding Materials, Equipments & Supplies, Concord - Wholesale, Manufacturers & Suppliers
- Roofing & Siding Veneers, Concord
- Roofing Consultants, Concord - Roofing Companies
- Roofing Contractors, Concord - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Concord
- Ryder Truck Rental , Concord - Ryder Moving
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