- Racing Car Supplies, Wallingford
- Radiator Coolant & Solvents, Wallingford - Engine Coolant
- Radio & Tv Broadcasting Equipment, Wallingford
- Radio Communications Equipment & Systems , Wallingford
- Radio Stations & Broadcasting Companies, Wallingford
- Radiologists, Wallingford - Radiology Doctors, Physicians & Surgeons
- Reading Instruction Schools, Wallingford
- Ready Mix Concrete, Wallingford - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Wallingford
- Real Estate, Wallingford - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Wallingford
- Real Estate Agent - Property Lessors, Wallingford
- Real Estate Appraiser, Wallingford - Appraisal Services
- Real Estate Appraisers & Consulting Services, Wallingford
- Real Estate Attorneys & Lawyers, Wallingford
- Real Estate Broker, Wallingford
- Real Estate Developers, Wallingford
- Real Estate Inspectors, Wallingford - Real Estate Inspection Service
- Real Estate Lawyers & Attorneys, Wallingford
- Real Estate Management, Wallingford
- Real Estate Rentals, Wallingford
- Real Estate Services, Wallingford
- Record Destruction Service, Wallingford
- Record Storage, Destruction & Management, Wallingford
- Recreational Equipment & Supplies Companies, Wallingford
- Recycling Drop-Off Centers, Wallingford
- Recycling Scrap & Waste Materials, Wallingford - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Wallingford
- Refrigeration & Air Conditioning Contractors, Wallingford - Installation, Repair, Sales & Service
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- Refrigeration & Cooling Equipment, Parts & Supplies , Wallingford - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Wallingford - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Wallingford - Fridge
- Rehabilitation Centers, Products & Services, Wallingford
- Rehabilitation Specialists, Wallingford
- Religious Education, Wallingford
- Religious Organizations, Wallingford
- Rental & Leasing Business Equipment, Wallingford
- Repair Services, Wallingford
- Repossession Services, Wallingford
- Research & Development Bureaus, Wallingford - Commercial, Economic, Sociological & Educational Research
- Research Services, Wallingford
- Residential, Wallingford
- Residential Apartments, Wallingford
- Residential Care Facilities, Wallingford
- Residential Construction Contractors, Wallingford - General Contractors
- Residential Real Estate Companies, Wallingford
- Resource Centers, Wallingford
- Restaurant & Lounge, Bar, Or Pub, Wallingford
- Restaurant Equipment, Wallingford
- Restaurant Equipment & Supplies, Wallingford
- Restaurant Equipment Repair & Service, Wallingford - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Lobster, Wallingford
- Restaurant Supplies & Equipment, Wallingford
- Restaurants/Food & Dining, Wallingford
- Retirement Home Referral Service, Wallingford - Nursing Home & Care Facilities Referrals & Information
- Rifle & Pistol Ranges, Wallingford
- Roofing Consultants, Wallingford - Roofing Companies
- Roofing Contractors, Wallingford - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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