- Bakeries, Williamsport
- Banks, Williamsport
- Bar Supplies, Equipment & Fixtures, Williamsport
- Barbers, Williamsport
- Bars, Williamsport
- Batteries Storage Manufacturers, Williamsport
- Battery, Williamsport - Retail Batteries Stores
- Battery Manufacturers, Williamsport
- Battery Storage, Williamsport
- Battery Stores, Williamsport
- Beauty Salons, Williamsport
- Beer & Wine Stores, Williamsport
- Beer Taverns, Williamsport
- Beverage & Juice Bottlers Manufacturers, Williamsport
- Beverage Alcoholic, Williamsport
- Beverage Non-Alcoholic Manufacturers, Williamsport
- Beverage Stores, Williamsport
- Beverages, Williamsport
- Bicycle Rentals, Williamsport - Bike Rental
- Bicycle Repair & Service, Williamsport - Bike Repair Shops
- Bicycle Shops, Williamsport - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billiard Supplies & Equipment, Williamsport - Pool Table
- Board Of Education, Williamsport
- Boat Services, Williamsport
- Bonds, Williamsport
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- Bottlers Equipment & Supplies, Williamsport
- Bottling Manufacturing, Williamsport
- Brake Service & Repair, Williamsport - Brake Pads
- Breakfast Restaurants, Williamsport
- Brethren Church, Williamsport
- Brick & Structural Product Manufacturers, Williamsport
- Brick Masonry & Bricklayer Contractors, Williamsport - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Williamsport - Companies, Wholesale, Manufacturers & Suppliers
- Brokers Hotel Motel & Apartment Houses, Williamsport
- Builders & Contractors, Williamsport
- Builders & Contractors - More, Williamsport
- Building Cleaning - Exterior, Williamsport - Cleaning Service
- Building Construction Consultants, Williamsport - Construction Management & Consulting
- Building Hardware & Materials, Williamsport
- Building Materials, Williamsport - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Williamsport
- Building Restoration & Preservation, Williamsport
- Burglar & Alarm Service, Williamsport - Monitoring Service
- Burglar Alarm Systems, Williamsport
- Business & Professional Associations, Williamsport
- Business Insurance, Williamsport
- Business Legal Services, Williamsport
- Business Services, Williamsport
- Business Wholesale, Williamsport
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