- Bakeries, Midlothian
- Bank Supplies & Equipment, Midlothian
- Banks, Midlothian
- Banquet Halls, Midlothian
- Baptist Churches, Midlothian
- Barbers, Midlothian
- Bars, Midlothian
- Bars & Grills, Midlothian
- Battery, Midlothian - Retail Batteries Stores
- Battery Storage, Midlothian
- Beauty Salons, Midlothian
- Beer Taverns, Midlothian
- Beverage Stores, Midlothian
- Boiler & Furnace Contractors, Midlothian - Installation, Cleaning & Repair Services
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- Brake Service & Repair, Midlothian - Brake Pads
- Breakfast Restaurants, Midlothian
- Builders & Contractors, Midlothian
- Builders & Contractors - More, Midlothian
- Builders Hardware Stores, Midlothian
- Building Construction Consultants, Midlothian - Construction Management & Consulting
- Building Design & Construction Consultants, Midlothian
- Building Materials & Supplies, Midlothian
- Burglar & Alarm Service, Midlothian - Monitoring Service
- Burglar Alarm Systems, Midlothian
- Business Insurance, Midlothian
- Business Legal Services, Midlothian
- Business Management Consultants, Midlothian
- Business Services, Midlothian
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