- Banks, Williamstown
- Banquet Halls, Williamstown
- Baptist Churches, Williamstown
- Barbers, Williamstown
- Beauty Salons, Williamstown
- Bereavement Services, Williamstown
- Beverage Stores, Williamstown
- Bible Church, Williamstown
- Bicycle Shops, Williamstown - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Boat Services, Williamstown
- Brick & Structural Product Manufacturers, Williamstown
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- Builders & Contractors, Williamstown
- Builders & Contractors - More, Williamstown
- Building & Home Inspection, Williamstown - Real Estate, Building, Land & House Inspection Service
- Building Cleaning - Exterior, Williamstown - Cleaning Service
- Building Hardware & Materials, Williamstown
- Building Materials & Supplies, Williamstown
- Burial Vaults, Williamstown
- Business Legal Services, Williamstown
- Business Management Consultants, Williamstown
- Business Services, Williamstown
- Business Wholesale, Williamstown
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