- Bakeries, Thurmont
- Bank Supplies & Equipment, Thurmont
- Bankruptcy Attorneys & Lawyers, Thurmont
- Bankruptcy Attorneys & Lawyers, Thurmont
- Bankruptcy Lawyers & Attorneys, Thurmont
- Banks, Thurmont
- Banquet Halls, Thurmont
- Baptist Churches, Thurmont
- Barbecue Restaurants, Thurmont
- Bars, Thurmont
- Bars & Grills, Thurmont
- Beauty Salons, Thurmont
- Beer Taverns, Thurmont
- Beverage Stores, Thurmont
- Boat Services, Thurmont
- Boats & Yachts, Thurmont - Yachts, Sailboats & Boats for Sale
- Boutiques & Boutique Items, Thurmont
- Breakfast Restaurants, Thurmont
- Brethren Church, Thurmont
- Brick Masonry & Bricklayer Contractors, Thurmont - Brick Mason - Install & Repair
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- Builders & Contractors, Thurmont
- Builders & Contractors - More, Thurmont
- Building & Property Maintenance & Services, Thurmont
- Building Construction Consultants, Thurmont - Construction Management & Consulting
- Building Hardware & Materials, Thurmont
- Building Materials, Thurmont - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Thurmont
- Buildings Concrete, Thurmont
- Burglar & Alarm Service, Thurmont - Monitoring Service
- Burglar Alarm Systems, Thurmont
- Business & Professional Associations, Thurmont
- Business & Trade Organizations, Thurmont
- Business Communication Consultants, Thurmont
- Business Forms, Systems & Supplies, Thurmont
- Business Legal Services, Thurmont
- Business Management Consultants, Thurmont
- Business Services, Thurmont
- Business Studio Rental, Thurmont
- Butchers & Meat Markets - Manufacturers, Thurmont
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