- Bail Bonds, North Sioux City
- Bakeries, North Sioux City
- Banks, North Sioux City
- Banquet Halls, North Sioux City
- Baptist Churches, North Sioux City
- Bariatricians, North Sioux City - Weight Loss Doctors, Physicians & Surgeons (Eating Disorders & Bariatric Medicine)
- Bars, North Sioux City
- Bars & Grills, North Sioux City
- Bearings, North Sioux City
- Beauty Salons, North Sioux City
- Beer & Wine Stores, North Sioux City
- Beer Taverns, North Sioux City
- Beverage Stores, North Sioux City
- Bingo Halls, Supplies & Equipment, North Sioux City
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- Biological Research, North Sioux City - Biological Labs
- Biotechnology Products & Services, North Sioux City
- Boats & Yachts, North Sioux City - Yachts, Sailboats & Boats for Sale
- Book Publishers, North Sioux City - Book Printing & Publishing
- Builders & Contractors, North Sioux City
- Builders & Contractors - More, North Sioux City
- Building Construction Consultants, North Sioux City - Construction Management & Consulting
- Building Materials, North Sioux City - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, North Sioux City
- Business Legal Services, North Sioux City
- Business Management Consultants, North Sioux City
- Business Services, North Sioux City
- Business, Vocational & Technical, North Sioux City
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