- Racing Car Supplies, Norwalk
- Racing Including Track Operations, Norwalk
- Radiator Repair, Norwalk - Gas Tank Repair
- Radio & Tv Communications Equipment Manufacturers, Norwalk
- Radio Stations & Broadcasting Companies, Norwalk
- Railroad & Subway Construction Contractors, Norwalk
- Railroad Contractors, Norwalk
- Reading Instruction Schools, Norwalk
- Ready Mix Concrete, Norwalk - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Norwalk
- Real Estate, Norwalk - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Norwalk
- Real Estate Appraiser, Norwalk - Appraisal Services
- Real Estate Appraisers & Consulting Services, Norwalk
- Real Estate Consultants, Norwalk
- Real Estate Services, Norwalk
- Recycling Drop-Off Centers, Norwalk
- Recycling Scrap & Waste Materials, Norwalk - Scrap Metal, etc
- Refrigeration & Cooling Equipment, Parts & Supplies , Norwalk - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Norwalk - Ac, Freezer, Refrigerator Repair
- Rehabilitation Centers, Products & Services, Norwalk
- Rehabilitation Specialists, Norwalk
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- Religious Education, Norwalk
- Religious Organizations, Norwalk
- Rental & Leasing Business Equipment, Norwalk
- Repair Services, Norwalk
- Research & Development Bureaus, Norwalk - Commercial, Economic, Sociological & Educational Research
- Research Services, Norwalk
- Residential, Norwalk
- Residential Apartments, Norwalk
- Residential Care Facilities, Norwalk
- Restaurant & Food Service Management Services, Norwalk
- Restaurant Equipment Cleaning, Norwalk - Restaurant Cleaners
- Restaurants/Food & Dining, Norwalk
- Retail Recovery Services, Norwalk
- Retaining Wall Contractors, Norwalk - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement Communities & Home, Assisted Living & Apartments, Norwalk
- Road Construction, Norwalk - Companies & Contractors
- Road Construction & Repair Contractors, Norwalk
- Roadside Assistance, Road Service & Towing Service, Norwalk
- Roofing Consultants, Norwalk - Roofing Companies
- Roofing Contractors, Norwalk - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products, Norwalk
- Rubber Stamps, Norwalk
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