- Bakeries, Southwest Harbor
- Balloons - Novelty, Toy & Decorative, Southwest Harbor
- Banks, Southwest Harbor
- Banquet Halls, Southwest Harbor
- Bars, Southwest Harbor
- Beauty Salons, Southwest Harbor
- Bed & Breakfast, Southwest Harbor
- Beverage Stores, Southwest Harbor
- Bicycle Rentals, Southwest Harbor - Bike Rental
- Bicycle Repair & Service, Southwest Harbor - Bike Repair Shops
- Bicycle Shops, Southwest Harbor - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Boat & Sailboat Equipment & Supplies Repair & Service, Southwest Harbor
- Boat & Yacht Brokers, Southwest Harbor
- Boat & Yacht Charter, Southwest Harbor
- Boat & Yacht Charters, Southwest Harbor
- Boat Covers, Tops & Upholstery, Southwest Harbor
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- Boat Motors & Marine Equipment Dealers, Southwest Harbor
- Boat Services, Southwest Harbor
- Boat Storage , Southwest Harbor - Equipment & Services
- Boat, Yacht & Sail Boat Transport, Southwest Harbor
- Boating Instruction, Southwest Harbor
- Boats & Yachts, Southwest Harbor - Yachts, Sailboats & Boats for Sale
- Breakfast Restaurants, Southwest Harbor
- Builders & Contractors, Southwest Harbor
- Builders & Contractors - More, Southwest Harbor
- Building Materials, Southwest Harbor - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Southwest Harbor
- Business & Professional Associations, Southwest Harbor
- Business Brokers, Southwest Harbor
- Business Legal Services, Southwest Harbor
- Business Management Consultants, Southwest Harbor
- Business Services, Southwest Harbor
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