- Radio & Television Repair Shops , Lowell - TV Repair
- Radio Communications Equipment & Systems , Lowell
- Radio Equipment & Parts Stores & Dealers, Lowell
- Real Estate, Lowell - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Lowell
- Recreational Organizations, Lowell
- Recreational Services, Lowell
- Recycling Drop-Off Centers, Lowell
- Recycling Scrap & Waste Materials, Lowell - Scrap Metal, etc
- Refrigerated Storage & Warehouse, Lowell - Warehousing
- Refrigerated Truck, Lowell
- Rehabilitation Centers, Products & Services, Lowell
- Rehabilitation Specialists, Lowell
- Religious Organizations, Lowell
- Rental & Leasing Business Equipment, Lowell
- Repair Services, Lowell
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- Research & Development Bureaus, Lowell - Commercial, Economic, Sociological & Educational Research
- Research Services, Lowell
- Residential, Lowell
- Residential Apartments, Lowell
- Residential Architect, Lowell
- Residential Architectural Designers, Lowell
- Residential Construction Contractors, Lowell - General Contractors
- Restaurant Equipment Cleaning, Lowell - Restaurant Cleaners
- Restaurants/Food & Dining, Lowell
- Rock Shops, Lowell
- Roofing Consultants, Lowell - Roofing Companies
- Roofing Contractors, Lowell - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Lowell
- RV & Campers Repair & Service, Lowell
- RV Repair, Lowell - Recreational Vehicle
- Ryder Truck Rental , Lowell - Ryder Moving
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