- Radio & Television Repair Shops , Hartford - TV Repair
- Radio Communications Equipment Service & Repair, Hartford
- Radio Stations & Broadcasting Companies, Hartford
- Radiologists, Hartford - Radiology Doctors, Physicians & Surgeons
- Radiotelephone Communications, Hartford
- Railroad Companies, Hartford
- Railroad Services, Hartford
- Rape Victim Services, Hartford
- Real Estate, Hartford - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Hartford
- Real Estate Agent - Property Lessors, Hartford
- Real Estate Apartments & Residential, Hartford
- Real Estate Appraiser, Hartford - Appraisal Services
- Real Estate Appraisers & Consulting Services, Hartford
- Real Estate Attorneys & Lawyers, Hartford
- Real Estate Broker, Hartford
- Real Estate Consultants, Hartford
- Real Estate Developers, Hartford
- Real Estate Management, Hartford
- Real Estate Properties, Hartford
- Real Estate Rentals, Hartford
- Real Estate Services, Hartford
- Record Labels, Hartford - Record Companies
- Recording Studio - Equipment & Rental, Hartford
- Recording Studio Service - Sound & Video, Hartford
- Recreational Equipment Repair & Service, Hartford
- Recreational Services, Hartford
- Recycling Drop-Off Centers, Hartford
- Recycling Pick Up Services, Hartford
- Recycling Scrap & Waste Materials, Hartford - Scrap Metal, etc
- Refrigerated Storage & Warehouse, Hartford - Warehousing
- Refrigeration & Cooling Equipment, Parts & Supplies , Hartford - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Hartford - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Hartford
- Refrigerator Sales, Service & Repair, Hartford - Fridge
- Refuse Collection & Disposal Services, Hartford
- Refuse Systems & Garbage Disposal, Hartford
- Rehabilitation Centers, Products & Services, Hartford
- Rehabilitation Specialists, Hartford
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- Rehabilitational Job Training Services, Hartford
- Religious Goods & Church Supplies Stores, Hartford
- Religious Organizations, Hartford
- Religious Services, Hartford
- Repair Services, Hartford
- Research & Development Bureaus, Hartford - Commercial, Economic, Sociological & Educational Research
- Research Services, Hartford
- Residential, Hartford
- Residential Apartments, Hartford
- Residential Care Facilities, Hartford
- Residential Construction Contractors, Hartford - General Contractors
- Resorts & Hotels, Hartford
- Restaurant & Food Service Management Services, Hartford
- Restaurant & Lounge, Bar, Or Pub, Hartford
- Restaurant Equipment, Hartford
- Restaurant Equipment & Supplies, Hartford
- Restaurant Equipment Repair & Service, Hartford - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Management & Consulting, Hartford - Food Facilities Consultants
- Restaurant Supplies & Equipment, Hartford
- Restaurants/Food & Dining, Hartford
- Resume Service, Hartford
- Retail Book Stores, Hartford
- Retaining Wall Contractors, Hartford - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement Communities & Home, Assisted Living & Apartments, Hartford
- Retirement Homes, Hartford
- Rheumatologists, Hartford - Rheumatology Doctors, Physicians & Surgeons
- Riding & Rodeo Services, Hartford
- Rigging Equipment & Supplies, Hartford
- Risk Management Consultants, Hartford
- Road Construction, Hartford - Companies & Contractors
- Road Construction & Repair Contractors, Hartford
- Roadside Assistance, Road Service & Towing Service, Hartford
- Rods, Springs & Suspension Equipment & Supplies, Hartford
- Roofing & Siding Materials, Equipments & Supplies, Hartford - Wholesale, Manufacturers & Suppliers
- Roofing Consultants, Hartford - Roofing Companies
- Roofing Contractors, Hartford - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Hartford
- Ryder Truck Rental , Hartford - Ryder Moving
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