- Radiators Heating, South Portland
- Radio & Television Repair Shops , South Portland - TV Repair
- Radio Stations & Broadcasting Companies, South Portland
- Radiotelephone Communications, South Portland
- Radon Testing & Services, South Portland
- Railroad & Subway Construction Contractors, South Portland
- Railroad Companies, South Portland
- Railroad Contractors, South Portland
- Reading Instruction Schools, South Portland
- Ready Mix Concrete, South Portland - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, South Portland
- Real Estate, South Portland - Agent, Broker & Companies
- Real Estate Agent & Broker Services, South Portland
- Real Estate Agent - Property Lessors, South Portland
- Real Estate Appraisers & Consulting Services, South Portland
- Real Estate Broker, South Portland
- Real Estate Consultants, South Portland
- Real Estate Developers, South Portland
- Real Estate Management, South Portland
- Real Estate Services, South Portland
- Record Destruction Service, South Portland
- Record Storage, Destruction & Management, South Portland
- Records, Tapes, CDs - Used & Vintage, South Portland
- Recreational Services, South Portland
- Recycling Drop-Off Centers, South Portland
- Recycling Scrap & Waste Materials, South Portland - Scrap Metal, etc
- Red Wing Shoes, South Portland
- Reducing Exercise & Weight Control Services, South Portland
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- Refrigerated Truck, South Portland
- Refrigeration & Cooling Equipment, Parts & Supplies , South Portland - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, South Portland - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, South Portland - Fridge
- Refuse Collection & Disposal, South Portland
- Refuse Systems & Garbage Disposal, South Portland
- Rehabilitation Centers, Products & Services, South Portland
- Rehabilitation Specialists, South Portland
- Religious Education, South Portland
- Religious Organizations, South Portland
- Repair Services, South Portland
- Research & Development Bureaus, South Portland - Commercial, Economic, Sociological & Educational Research
- Research Services, South Portland
- Resident Camps, South Portland
- Residential, South Portland
- Residential Apartments, South Portland
- Restaurant & Lounge, Bar, Or Pub, South Portland
- Restaurant Equipment Cleaning, South Portland - Restaurant Cleaners
- Restaurant Equipment Repair & Service, South Portland - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Lobster, South Portland
- Restaurant Management & Consulting, South Portland - Food Facilities Consultants
- Restaurants/Food & Dining, South Portland
- Retail Book Stores, South Portland
- Retirement Communities & Home, Assisted Living & Apartments, South Portland
- Roadside Assistance, Road Service & Towing Service, South Portland
- Roofing Consultants, South Portland - Roofing Companies
- Roofing Contractors, South Portland - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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