- Racing Car Supplies, Somerville
- Radiator Coolant & Solvents, Somerville - Engine Coolant
- Radiator Repair, Somerville - Gas Tank Repair
- Railroad & Subway Construction Contractors, Somerville
- Railroad Contractors, Somerville
- Real Estate, Somerville - Agent, Broker & Companies
- Real Estate & Insurance Schools, Somerville
- Real Estate Agent & Broker Services, Somerville
- Real Estate Agent - Property Lessors, Somerville
- Real Estate Appraiser, Somerville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Somerville
- Real Estate Attorneys & Lawyers, Somerville
- Real Estate Attorneys & Lawyers, Somerville
- Real Estate Broker, Somerville
- Real Estate Consultants, Somerville
- Real Estate Developers, Somerville
- Real Estate Lawyers & Attorneys, Somerville
- Real Estate Management, Somerville
- Real Estate Properties, Somerville
- Real Estate Property Investment Properties, Somerville
- Real Estate Services, Somerville
- Records, Tapes, CDs - Used & Vintage, Somerville
- Recreational Services, Somerville
- Recycling Drop-Off Centers, Somerville
- Reducing Exercise & Weight Control Services, Somerville
- Reformed Churches, Somerville
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- Refuse Collection & Disposal, Somerville
- Refuse Systems & Garbage Disposal, Somerville
- Rehabilitation Centers, Products & Services, Somerville
- Rehabilitation Specialists, Somerville
- Relief Organizations, Somerville
- Religious Education, Somerville
- Religious Organizations, Somerville
- Religious Practitioners, Somerville
- Repair Services, Somerville
- Research & Development Bureaus, Somerville - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Somerville - Laboratories
- Research Services, Somerville
- Residential, Somerville
- Residential Apartments, Somerville
- Residential Construction Contractors, Somerville - General Contractors
- Restaurants/Food & Dining, Somerville
- Resume Service, Somerville
- Retail Book Stores, Somerville
- Rheem / Rudd Heating & Air Conditioning Contractors, Somerville - Air Conditioner Contractors & Systems
- Rigging Equipment & Supplies, Somerville
- Rigging Service & Crane Hoisting, Somerville
- Road Construction, Somerville - Companies & Contractors
- Roofing Consultants, Somerville - Roofing Companies
- Roofing Contractors, Somerville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rooming & Boarding Houses, Somerville
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