- Racing Car Supplies, Boxborough
- Radio Communications Equipment & Systems , Boxborough
- Real Estate, Boxborough - Agent, Broker & Companies
- Real Estate Cash Buy-Outs, Boxborough
- Real Estate Management, Boxborough
- Real Estate Services, Boxborough
- Recreational Services, Boxborough
- Recycling Drop-Off Centers, Boxborough
- Religious Organizations, Boxborough
- Repair Services, Boxborough
- Research & Development Bureaus, Boxborough - Commercial, Economic, Sociological & Educational Research
- Research Services, Boxborough
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- Resident Buyers, Boxborough
- Residential Care Facilities, Boxborough
- Residential Construction Contractors, Boxborough - General Contractors
- Restaurant & Food Service Management Services, Boxborough
- Restaurants/Food & Dining, Boxborough
- Resume Service, Boxborough
- Retirement & Estate Planning, Boxborough
- Retirement Planning Consultants & Services, Boxborough
- Rigging Service & Crane Hoisting, Boxborough
- Roofing Consultants, Boxborough - Roofing Companies
- Roofing Contractors, Boxborough - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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