- Bakeries, Smithville
- Bankruptcy Services, Smithville
- Banks, Smithville
- Barber Shops, Smithville
- Bars & Grills, Smithville
- Beauty Salons, Smithville
- Beer & Wine Stores, Smithville
- Beverage Stores, Smithville
- Bicycle & Motorcycle Services, Smithville
- Biotechnology, Smithville
- Boiler Repair & Cleaning, Smithville
- Brake Service & Repair, Smithville - Brake Pads
- Breakfast Restaurants, Smithville
- Bricks, Blocks & Stone Products, Smithville - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Smithville
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- Builders & Contractors - More, Smithville
- Builders Hardware Stores, Smithville
- Building & Property Maintenance & Services, Smithville
- Building Construction Consultants, Smithville - Construction Management & Consulting
- Building Materials, Smithville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Smithville
- Bus Lines, Smithville - Bus Transportation
- Bus Rental & Charter Bus Service, Smithville
- Business & Professional Associations, Smithville
- Business & Trade Organizations, Smithville
- Business Forms, Systems & Supplies, Smithville
- Business Legal Services, Smithville
- Business Services, Smithville
- Butchers & Meat Markets - Manufacturers, Smithville
- Butchers Equipment & Supplies, Smithville
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