- Bagels, Mercer Island
- Bakeries, Mercer Island
- Bank Supplies & Equipment, Mercer Island
- Banks, Mercer Island
- Baptist Churches, Mercer Island
- Barbers, Mercer Island
- Bars, Mercer Island
- Bars & Grills, Mercer Island
- Beach & Water Related Services, Mercer Island
- Beauty Salons, Mercer Island
- Beer & Wine Stores, Mercer Island
- Beer Taverns, Mercer Island
- Behavioral Health Doctors, Physicians & Surgeons, Mercer Island - Behavioral Medicine
- Beverage Stores, Mercer Island
- Bicycle Shops, Mercer Island - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billing Services, Mercer Island
- Bird Cages & Accessories, Mercer Island
- Birds, Mercer Island
- Birds & Bird Supplies , Mercer Island
- Bistros, Mercer Island
- Boating Instruction, Mercer Island
- Boiler - New & Used, Mercer Island - Radiant Heating
- Bonds, Mercer Island
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- Bookkeeping Services Licensed, Mercer Island
- Bookkeeping Systems & Services, Mercer Island
- Books, Magazines & Newspapers Stores, Mercer Island - Bookstores
- Boutiques & Boutique Items, Mercer Island
- Builders & Contractors, Mercer Island
- Builders & Contractors - More, Mercer Island
- Building & Property Maintenance & Services, Mercer Island
- Building Construction Consultants, Mercer Island - Construction Management & Consulting
- Building Design & Construction Consultants, Mercer Island
- Building Materials, Mercer Island - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Mercer Island
- Burglar & Alarm Service, Mercer Island - Monitoring Service
- Burglar Alarm Systems, Mercer Island
- Business & Professional Associations, Mercer Island
- Business Communication Consultants, Mercer Island
- Business Insurance, Mercer Island
- Business Legal Services, Mercer Island
- Business Management Consultants, Mercer Island
- Business Planning & Consulting, Mercer Island
- Business Services, Mercer Island
- Business Wholesale, Mercer Island
- Business, Vocational & Technical, Mercer Island
- Butchers & Meat Markets - Manufacturers, Mercer Island
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