- Bakeries, Boxborough
- Balancing Service, Boxborough - Wheel & Tire Balancing
- Balancing Service Industrial, Boxborough
- Banks, Boxborough
- Banquet Halls, Boxborough
- Bars & Grills, Boxborough
- Baseball & Softball Batting Ranges, Boxborough
- Bath Houses, Boxborough
- Beauty Salons, Boxborough
- Beverage Stores, Boxborough
- Boats & Yachts, Boxborough - Yachts, Sailboats & Boats for Sale
- Breakfast Restaurants, Boxborough
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- Brick Masonry & Bricklayer Contractors, Boxborough - Brick Mason - Install & Repair
- Builders & Contractors, Boxborough
- Builders & Contractors - More, Boxborough
- Building & Home Inspection, Boxborough - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Boxborough
- Building Construction Consultants, Boxborough - Construction Management & Consulting
- Building Materials, Boxborough - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Boxborough
- Business Legal Services, Boxborough
- Business Management Consultants, Boxborough
- Business Services, Boxborough
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