- Racquetball Courts, Waltham
- Radar Equipment & Supplies, Waltham
- Radio Broadcasting Program Producers, Waltham
- Radio Communications Equipment & Systems , Waltham
- Radio Equipment & Parts Stores & Dealers, Waltham
- Radio Stations & Broadcasting Companies, Waltham
- Radiotelephone Communications, Waltham
- Radon Testing & Services, Waltham
- Railroad Car Leasing Services, Waltham
- Railroad Services, Waltham
- Rape Victim Services, Waltham
- Ready Mix Concrete, Waltham - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Waltham
- Real Estate, Waltham - Agent, Broker & Companies
- Real Estate & Insurance Schools, Waltham
- Real Estate Agent - Property Lessors, Waltham
- Real Estate Appraiser, Waltham - Appraisal Services
- Real Estate Appraisers & Consulting Services, Waltham
- Real Estate Consultants, Waltham
- Real Estate Developers, Waltham
- Real Estate Investment Trusts, Waltham
- Real Estate Management, Waltham
- Real Estate Office Buildings Warehouses & Factories, Waltham
- Real Estate Properties, Waltham
- Real Estate Rentals, Waltham
- Real Estate Services, Waltham
- Record Storage, Destruction & Management, Waltham
- Recording Studio - Equipment & Rental, Waltham
- Records, Tapes, CDs - Used & Vintage, Waltham
- Recreational Equipment & Supplies Companies, Waltham
- Recreational Services, Waltham
- Recycling Drop-Off Centers, Waltham
- Recycling Scrap & Waste Materials, Waltham - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Waltham
- Reflexologists, Waltham
- Refreshment Stands, Waltham
- Refrigeration & Air Conditioning Contractors, Waltham - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Waltham - Water Cooler, Ice Machine, Beverage Dispenser, etc
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- Refrigeration Repair & Service, Waltham - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Waltham - Fridge
- Registered Education Savings Plan, Waltham
- Rehabilitation Centers, Products & Services, Waltham
- Rehabilitation Specialists, Waltham
- Rehabilitational Job Training Services, Waltham
- Relief Organizations, Waltham
- Religious Goods & Church Supplies Stores, Waltham
- Religious Organizations, Waltham
- Rental & Leasing Business Equipment, Waltham
- Repair Services, Waltham
- Research & Development Bureaus, Waltham - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Waltham - Laboratories
- Research Film Laboratories & Film Services Motion Pictures, Waltham
- Research Services, Waltham
- Residential, Waltham
- Residential Apartments, Waltham
- Residential Care Facilities, Waltham
- Residential Construction Contractors, Waltham - General Contractors
- Residential Electricians, Waltham - Electric Contractors
- Residential Lighting Fixtures Manufacturers, Waltham
- Restaurant & Food Service Management Services, Waltham
- Restaurant & Lounge, Bar, Or Pub, Waltham
- Restaurant Equipment, Waltham
- Restaurant Equipment & Supplies, Waltham
- Restaurant Supplies & Equipment, Waltham
- Restaurants/Food & Dining, Waltham
- Retail Book Stores, Waltham
- Retirement & Estate Planning, Waltham
- Retirement Communities & Home, Assisted Living & Apartments, Waltham
- Retirement Planning Consultants & Services, Waltham
- Risk Management Consultants, Waltham
- Roadside Assistance, Road Service & Towing Service, Waltham
- Roofing Consultants, Waltham - Roofing Companies
- Roofing Contractors, Waltham - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Waltham
- Rubber Products - Retail, Waltham
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