- Racing Car Supplies, New Haven
- Radio Stations & Broadcasting Companies, New Haven
- Railroad & Subway Construction Contractors, New Haven
- Railroad Contractors, New Haven
- Real Estate, New Haven - Agent, Broker & Companies
- Real Estate Properties, New Haven
- Real Estate Property Investment Properties, New Haven
- Real Estate Services, New Haven
- Recreational Equipment & Supplies Companies, New Haven
- Recycling Scrap & Waste Materials, New Haven - Scrap Metal, etc
- Refrigerated Truck, New Haven
- Rehabilitation Centers, Products & Services, New Haven
- Rehabilitation Specialists, New Haven
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- Religious Organizations, New Haven
- Religious Practitioners, New Haven
- Repair Services, New Haven
- Research & Development Bureaus, New Haven - Commercial, Economic, Sociological & Educational Research
- Research Services, New Haven
- Residential, New Haven
- Residential Apartments, New Haven
- Residential Care Facilities, New Haven
- Residential Construction Contractors, New Haven - General Contractors
- Restaurant & Lounge, Bar, Or Pub, New Haven
- Restaurants/Food & Dining, New Haven
- Roofing Consultants, New Haven - Roofing Companies
- Roofing Contractors, New Haven - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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