- Racing Car Supplies, North Haven
- Rackets Restringing & Repair, North Haven
- Racquetball Courts, North Haven
- Railroad Services, North Haven
- Range & Oven Repair, Service & Sales, North Haven
- Ready Mix Concrete, North Haven - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, North Haven
- Real Estate, North Haven - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, North Haven
- Real Estate Appraiser, North Haven - Appraisal Services
- Real Estate Appraisers & Consulting Services, North Haven
- Real Estate Attorneys & Lawyers, North Haven
- Real Estate Attorneys & Lawyers, North Haven
- Real Estate Consultants, North Haven
- Real Estate Developers, North Haven
- Real Estate Lawyers & Attorneys, North Haven
- Real Estate Management, North Haven
- Real Estate Rentals, North Haven
- Real Estate Services, North Haven
- Record Storage, Destruction & Management, North Haven
- Recording Studio Service - Sound & Video, North Haven
- Recreational Equipment Repair & Service, North Haven
- Recreational Services, North Haven
- Recycling Drop-Off Centers, North Haven
- Recycling Scrap & Waste Materials, North Haven - Scrap Metal, etc
- Refrigerated Truck, North Haven
- Refrigeration Repair & Service, North Haven - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, North Haven - Fridge
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- Refuse Collection & Disposal Services, North Haven
- Rehabilitation Centers, Products & Services, North Haven
- Rehabilitation Specialists, North Haven
- Rehabilitational Job Training Services, North Haven
- Religious Goods & Church Supplies Stores, North Haven
- Religious Organizations, North Haven
- Remodeling & Repairing Building Contractors Referral, North Haven
- Repair Services, North Haven
- Research & Development Bureaus, North Haven - Commercial, Economic, Sociological & Educational Research
- Research Services, North Haven
- Residential, North Haven
- Residential Apartments, North Haven
- Residential Care Facilities, North Haven
- Residential Construction Contractors, North Haven - General Contractors
- Residential Construction Referral Services, North Haven
- Restaurant & Food Service Management Services, North Haven
- Restaurant Equipment Repair & Service, North Haven - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Lobster, North Haven
- Restaurants - Breakfast Brunch Lunch, North Haven
- Restaurants/Food & Dining, North Haven
- Retail Book Stores, North Haven
- Retirement Communities & Home, Assisted Living & Apartments, North Haven
- Retirement Homes, North Haven
- Rigging Service & Crane Hoisting, North Haven
- Roofing Consultants, North Haven - Roofing Companies
- Roofing Contractors, North Haven - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, North Haven
- Ryder Truck Rental , North Haven - Ryder Moving
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