- Radiator Coolant & Solvents, Westbrook - Engine Coolant
- Radiologists, Westbrook - Radiology Doctors, Physicians & Surgeons
- Railroad Companies, Westbrook
- Reading Instruction Schools, Westbrook
- Ready Mix Concrete, Westbrook - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Westbrook
- Real Estate, Westbrook - Agent, Broker & Companies
- Real Estate Appraisers & Consulting Services, Westbrook
- Real Estate Consultants, Westbrook
- Real Estate Services, Westbrook
- Recreational Equipment & Supplies Companies, Westbrook
- Recreational Equipment Repair & Service, Westbrook
- Recreational Good Manufacturers, Westbrook
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- Reebok Shoes, Westbrook
- Refuse Collection & Disposal, Westbrook
- Refuse Systems & Garbage Disposal, Westbrook
- Religious Organizations, Westbrook
- Relocation Services, Westbrook
- Repair Services, Westbrook
- Residential Construction Contractors, Westbrook - General Contractors
- Resorts & Hotels, Westbrook
- Restaurant & Lounge, Bar, Or Pub, Westbrook
- Restaurants/Food & Dining, Westbrook
- Retirement Homes, Westbrook
- Riding & Rodeo Services, Westbrook
- Riding Apparel & Equipment, Westbrook
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