- Racing Car Supplies, Lowell
- Radio & Television Repair Shops , Lowell - TV Repair
- Radio Stations & Broadcasting Companies, Lowell
- Real Estate, Lowell - Agent, Broker & Companies
- Real Estate Services, Lowell
- Reformed Churches, Lowell
- Rehabilitation Centers, Products & Services, Lowell
- Rehabilitation Specialists, Lowell
- Rehabilitational Job Training Services, Lowell
- Religious Organizations, Lowell
- Religious Practitioners, Lowell
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- Repair Services, Lowell
- Residential, Lowell
- Residential Apartments, Lowell
- Residential Care Facilities, Lowell
- Residential Construction Contractors, Lowell - General Contractors
- Restaurants/Food & Dining, Lowell
- Retirement Communities & Home, Assisted Living & Apartments, Lowell
- Riding & Rodeo Services, Lowell
- Roller Skating Rinks, Lowell
- Roofing Consultants, Lowell - Roofing Companies
- Roofing Contractors, Lowell - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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