- Race Car Dealers, Millbury
- Radio & Television Repair Shops , Millbury - TV Repair
- Railroad Ties, Millbury
- Ready Mix Concrete, Millbury - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Millbury
- Real Estate, Millbury - Agent, Broker & Companies
- Real Estate Services, Millbury
- Recycling Drop-Off Centers, Millbury
- Recycling Scrap & Waste Materials, Millbury - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Millbury
- Refuse Collection & Disposal Services, Millbury
- Refuse Systems & Garbage Disposal, Millbury
- Religious Education, Millbury
- Religious Organizations, Millbury
- Repair Services, Millbury
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- Residential, Millbury
- Residential Apartments, Millbury
- Residential Care Facilities, Millbury
- Residential Construction Contractors, Millbury - General Contractors
- Resins Wholesale & Retail, Millbury - Plastic Raw Materials
- Restaurants/Food & Dining, Millbury
- Retail Book Stores, Millbury
- Retirement Communities & Home, Assisted Living & Apartments, Millbury
- Road Construction, Millbury - Companies & Contractors
- Road Construction & Repair Contractors, Millbury
- Road Construction Equipment & Machinery, Millbury
- Roofing & Siding Materials, Equipments & Supplies, Millbury - Wholesale, Manufacturers & Suppliers
- Roofing Consultants, Millbury - Roofing Companies
- Roofing Contractors, Millbury - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Millbury
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