- Banks, Crownsville
- Baptist Churches, Crownsville
- Bars, Crownsville
- Bars & Grills, Crownsville
- Beauty Salons, Crownsville
- Beer Taverns, Crownsville
- Boat Services, Crownsville
- Boat Storage , Crownsville - Equipment & Services
- Boats & Yachts, Crownsville - Yachts, Sailboats & Boats for Sale
- Boiler Repair & Cleaning, Crownsville
- Bonds, Crownsville
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- Brake Service & Repair, Crownsville - Brake Pads
- Builders & Contractors, Crownsville
- Builders & Contractors - More, Crownsville
- Building & Property Maintenance & Services, Crownsville
- Building Construction Consultants, Crownsville - Construction Management & Consulting
- Building Materials & Supplies, Crownsville
- Burglar Alarm Systems, Crownsville
- Bus Lines, Crownsville - Bus Transportation
- Bus Rental & Charter Bus Service, Crownsville
- Business Legal Services, Crownsville
- Business Services, Crownsville
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