- Radio Stations & Broadcasting Companies, Southborough
- Real Estate, Southborough - Agent, Broker & Companies
- Real Estate Appraiser, Southborough - Appraisal Services
- Real Estate Appraisers & Consulting Services, Southborough
- Real Estate Developers, Southborough
- Real Estate Management, Southborough
- Real Estate Services, Southborough
- Recreational Services, Southborough
- Refrigerated Storage & Warehouse, Southborough - Warehousing
- Rehabilitational Job Training Services, Southborough
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- Religious Organizations, Southborough
- Repair Services, Southborough
- Research & Development Bureaus, Southborough - Commercial, Economic, Sociological & Educational Research
- Research Services, Southborough
- Residential Construction Contractors, Southborough - General Contractors
- Restaurants/Food & Dining, Southborough
- Roof Cleaning & Maintenance, Southborough - Roofing Services
- Roofing Consultants, Southborough - Roofing Companies
- Roofing Contractors, Southborough - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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