- Racing Car Supplies, Hartford
- Radio Stations & Broadcasting Companies, Hartford
- Radiotelephone Communications, Hartford
- Railroad & Subway Construction Contractors, Hartford
- Railroad Companies, Hartford
- Railroad Contractors, Hartford
- Ready Mix Concrete, Hartford - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Hartford
- Real Estate, Hartford - Agent, Broker & Companies
- Real Estate Investment Trusts, Hartford
- Real Estate Services, Hartford
- Refrigeration & Cooling Equipment, Parts & Supplies , Hartford - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Religious Organizations, Hartford
- Repair Services, Hartford
- Residential, Hartford
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- Residential Apartments, Hartford
- Residential Care Facilities, Hartford
- Residential Construction Contractors, Hartford - General Contractors
- Residential Real Estate Companies, Hartford
- Restaurant & Lounge, Bar, Or Pub, Hartford
- Restaurant Equipment, Hartford
- Restaurant Equipment & Supplies, Hartford
- Restaurant Supplies & Equipment, Hartford
- Restaurants/Food & Dining, Hartford
- Retirement Home Referral Service, Hartford - Nursing Home & Care Facilities Referrals & Information
- Roofing Consultants, Hartford - Roofing Companies
- Roofing Contractors, Hartford - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Contractors Referral Services, Hartford
- Roofing Materials & Supplies, Hartford
- Roofing Siding & Sheet Metal Referral Services, Hartford
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