- Racing Car Supplies, Middlesex
- Radio & Television Repair Shops , Middlesex - TV Repair
- Real Estate, Middlesex - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Middlesex
- Real Estate Appraiser, Middlesex - Appraisal Services
- Real Estate Appraisers & Consulting Services, Middlesex
- Real Estate Attorneys & Lawyers, Middlesex
- Real Estate Attorneys & Lawyers, Middlesex
- Real Estate Lawyers & Attorneys, Middlesex
- Real Estate Management, Middlesex
- Real Estate Services, Middlesex
- Recycling Drop-Off Centers, Middlesex
- Recycling Scrap & Waste Materials, Middlesex - Scrap Metal, etc
- Refrigeration & Cooling Equipment, Parts & Supplies , Middlesex - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Middlesex - Ac, Freezer, Refrigerator Repair
- Refuse Collection & Disposal Services, Middlesex
- Rehabilitation Centers, Products & Services, Middlesex
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- Rehabilitation Specialists, Middlesex
- Religious Organizations, Middlesex
- Religious Services, Middlesex
- Repair Services, Middlesex
- Research & Development Labs, Middlesex - Laboratories
- Research Services, Middlesex
- Residential, Middlesex
- Residential Apartments, Middlesex
- Residential Construction Contractors, Middlesex - General Contractors
- Residential Landfills, Middlesex
- Restaurant Equipment, Middlesex
- Restaurant Equipment & Supplies, Middlesex
- Restaurant Supplies & Equipment, Middlesex
- Restaurants/Food & Dining, Middlesex
- Retail Book Stores, Middlesex
- Roofing Consultants, Middlesex - Roofing Companies
- Roofing Contractors, Middlesex - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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