- Racing Car Supplies, East Haven
- Radiology Equipment & Services, East Haven - X-Ray Equipment & Supplies
- Railroad Companies, East Haven
- Real Estate, East Haven - Agent, Broker & Companies
- Real Estate Agent & Broker Services, East Haven
- Real Estate Appraisers & Consulting Services, East Haven
- Real Estate Attorneys & Lawyers, East Haven
- Real Estate Broker, East Haven
- Real Estate Consultants, East Haven
- Real Estate Developers, East Haven
- Real Estate Services, East Haven
- Recreational Organizations, East Haven
- Recycling Drop-Off Centers, East Haven
- Reducing Exercise & Weight Control Services, East Haven
- Rehabilitation Centers, Products & Services, East Haven
- Rehabilitation Specialists, East Haven
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- Religious Education, East Haven
- Religious Organizations, East Haven
- Repair Services, East Haven
- Research & Development Bureaus, East Haven - Commercial, Economic, Sociological & Educational Research
- Research Services, East Haven
- Residential, East Haven
- Residential Apartments, East Haven
- Residential Care Facilities, East Haven
- Residential Construction Contractors, East Haven - General Contractors
- Restaurant & Lounge, Bar, Or Pub, East Haven
- Restaurant Management & Consulting, East Haven - Food Facilities Consultants
- Restaurants/Food & Dining, East Haven
- Retirement Communities & Home, Assisted Living & Apartments, East Haven
- Retirement Homes, East Haven
- Roofing Consultants, East Haven - Roofing Companies
- Roofing Contractors, East Haven - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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