- Racing Including Track Operations, Hartford
- Real Estate, Hartford - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Hartford
- Real Estate Services, Hartford
- Recreational Services, Hartford
- Reducing Exercise & Weight Control Services, Hartford
- Refrigeration & Air Conditioning Contractors, Hartford - Installation, Repair, Sales & Service
- Refuse Collection & Disposal Services, Hartford
- Refuse Systems & Garbage Disposal, Hartford
- Rehabilitation Centers, Products & Services, Hartford
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- Rehabilitation Specialists, Hartford
- Religious Organizations, Hartford
- Repair Services, Hartford
- Residential, Hartford
- Residential Apartments, Hartford
- Restaurants/Food & Dining, Hartford
- Retirement Communities & Home, Assisted Living & Apartments, Hartford
- Road Construction, Hartford - Companies & Contractors
- Road Construction & Repair Contractors, Hartford
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