- Baby Stores, Duncan - Baby Accessories & Clothes
- Bail Bonds, Duncan
- Bakeries, Duncan
- Balloons, Duncan
- Bank Architects, Duncan
- Banks, Duncan
- Banquet Halls, Duncan
- Banquet Halls, Reception Halls & Party Facilities, Duncan
- Baptist Churches, Duncan
- Barbecue Restaurants, Duncan
- Barber Shop & Beauty Salon Supplies & Equipment, Duncan - Beauty & Barber Supplies
- Barbers, Duncan
- Bars, Duncan
- Bars & Grills, Duncan
- Baseball & Softball Clubs, Duncan
- Battery, Duncan - Retail Batteries Stores
- Battery Storage, Duncan
- Beach & Water Related Services, Duncan
- Beads Decor, Duncan
- Bearings, Duncan
- Beauty Cosmetic & Salon Equipment & Supplies Manufacturers, Duncan
- Beauty Salons, Duncan
- Bed & Breakfast, Duncan
- Bedroom Furniture Stores, Duncan - Master & Kids Bedroom Furniture Sets & Beds
- Beer Taverns, Duncan
- Bereavement Services, Duncan
- Bible Church, Duncan
- Bicycle Rentals, Duncan - Bike Rental
- Bicycle Repair & Service, Duncan - Bike Repair Shops
- Bicycle Shops, Duncan - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billing Services, Duncan
- Boat Services, Duncan
- Boat Storage , Duncan - Equipment & Services
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- Boats & Yachts, Duncan - Yachts, Sailboats & Boats for Sale
- Bonds, Duncan
- Bonds Surety & Fidelity, Duncan
- Bookkeeping Services Commercial, Duncan
- Bookkeeping Services Licensed, Duncan
- Bookkeeping Systems & Services, Duncan
- Boots Retail, Duncan
- Bottled Gas, Lp Gas & Propane Dealers, Duncan
- Boutiques & Boutique Items, Duncan
- Bowling Centers, Duncan
- Brake Service & Repair, Duncan - Brake Pads
- Breakfast Restaurants, Duncan
- Buffet Restaurants, Duncan
- Builders & Contractors, Duncan
- Builders & Contractors - More, Duncan
- Builders Hardware Stores, Duncan
- Building & House Moving & Erecting Contractors, Duncan
- Building Construction Consultants, Duncan - Construction Management & Consulting
- Building Hardware & Materials, Duncan
- Building Materials, Duncan - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Duncan
- Burglar & Alarm Service, Duncan - Monitoring Service
- Burglar Alarm Systems, Duncan
- Burial Advisory Service, Duncan
- Bus Lines, Duncan - Bus Transportation
- Bus Lines Ticket Agencies, Duncan
- Business & Professional Associations, Duncan
- Business Brokers, Duncan
- Business Insurance, Duncan
- Business Legal Services, Duncan
- Business Management Consultants, Duncan
- Business Services, Duncan
- Business, Vocational & Technical, Duncan
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