- Racing Car Supplies, Lowell
- Radiator Repair, Lowell - Gas Tank Repair
- Radio & Television Repair Shops , Lowell - TV Repair
- Radio Communications Equipment & Systems , Lowell
- Real Estate, Lowell - Agent, Broker & Companies
- Real Estate Appraiser, Lowell - Appraisal Services
- Real Estate Appraisers & Consulting Services, Lowell
- Real Estate Services, Lowell
- Recycling Drop-Off Centers, Lowell
- Religious Organizations, Lowell
- Repair Services, Lowell
- Research Service Libraries, Lowell
- Residential, Lowell
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- Residential Apartments, Lowell
- Residential Construction Contractors, Lowell - General Contractors
- Residential Landfills, Lowell
- Restaurant & Lounge, Bar, Or Pub, Lowell
- Restaurant Equipment Repair & Service, Lowell - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Management & Consulting, Lowell - Food Facilities Consultants
- Restaurants/Food & Dining, Lowell
- Retail Book Stores, Lowell
- Road Construction, Lowell - Companies & Contractors
- Road Construction & Repair Contractors, Lowell
- Roofing Consultants, Lowell - Roofing Companies
- Roofing Contractors, Lowell - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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