- Banks, Rockville
- Baptist Churches, Rockville
- Barbecue Grills & Supplies, Rockville
- Barbers, Rockville
- Beauty Salons, Rockville
- Bed & Breakfast, Rockville
- Bedroom Furniture Stores, Rockville - Master & Kids Bedroom Furniture Sets & Beds
- Bingo Halls, Supplies & Equipment, Rockville
- Bird Repellent, Barrier & Control, Rockville
- Boat Services, Rockville
- Boat Storage , Rockville - Equipment & Services
- Boats & Yachts, Rockville - Yachts, Sailboats & Boats for Sale
- Bonds, Rockville
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- Boutiques & Boutique Items, Rockville
- Breakfast Restaurants, Rockville
- Builders & Contractors, Rockville
- Builders & Contractors - More, Rockville
- Builders Hardware Stores, Rockville
- Building & Home Inspection, Rockville - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, Rockville - Construction Management & Consulting
- Building Hardware & Materials, Rockville
- Building Materials & Supplies, Rockville
- Business & Professional Associations, Rockville
- Business Legal Services, Rockville
- Business Services, Rockville
- Business, Vocational & Technical, Rockville
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