- Racing Including Track Operations, Billerica
- Radiators Heating, Billerica
- Radio & Television Repair Shops , Billerica - TV Repair
- Radiotelephone Communications, Billerica
- Radon Testing & Services, Billerica
- Real Estate, Billerica - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Billerica
- Real Estate Agent - Property Lessors, Billerica
- Real Estate Appraiser, Billerica - Appraisal Services
- Real Estate Appraisers & Consulting Services, Billerica
- Real Estate Broker, Billerica
- Real Estate Management, Billerica
- Real Estate Services, Billerica
- Record Storage, Destruction & Management, Billerica
- Recreational Equipment Repair & Service, Billerica
- Recreational Good Manufacturers, Billerica
- Recycling Drop-Off Centers, Billerica
- Recycling Scrap & Waste Materials, Billerica - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Billerica
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- Rehabilitation Centers, Products & Services, Billerica
- Rehabilitation Specialists, Billerica
- Religious Organizations, Billerica
- Repair Services, Billerica
- Research & Development Engineers, Billerica
- Research & Development Labs, Billerica - Laboratories
- Research Services, Billerica
- Residential, Billerica
- Residential Apartments, Billerica
- Residential Care Facilities, Billerica
- Residential Construction Contractors, Billerica - General Contractors
- Restaurants/Food & Dining, Billerica
- Retaining Wall Contractors, Billerica - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement Communities & Home, Assisted Living & Apartments, Billerica
- Rigging Equipment & Supplies, Billerica
- Roast Beef Restaurants, Billerica
- Roofing Consultants, Billerica - Roofing Companies
- Roofing Contractors, Billerica - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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