- Bakeries, Hopkinton
- Bank Supplies & Equipment, Hopkinton
- Banks, Hopkinton
- Barbers, Hopkinton
- Bars, Hopkinton
- Bars & Grills, Hopkinton
- Beauty Salons, Hopkinton
- Beverage Stores, Hopkinton
- Biological Products & Supplies, Hopkinton
- Biological Research, Hopkinton - Biological Labs
- Boiler Repair & Cleaning, Hopkinton
- Breakfast Restaurants, Hopkinton
- Brick Masonry & Bricklayer Contractors, Hopkinton - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Hopkinton - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Hopkinton
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- Builders & Contractors - More, Hopkinton
- Builders Hardware Stores, Hopkinton
- Building & Home Inspection, Hopkinton - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, Hopkinton - Construction Management & Consulting
- Building Materials, Hopkinton - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Hopkinton
- Building Site Preparation Contractors, Hopkinton - Land Preparation & Land Clearing
- Bus Rental & Charter Bus Service, Hopkinton
- Business & Professional Associations, Hopkinton
- Business & Trade Organizations, Hopkinton
- Business Legal Services, Hopkinton
- Business Management Consultants, Hopkinton
- Business Services, Hopkinton
- Business, Vocational & Technical, Hopkinton
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