- Bail Bonds, New Castle
- Banks, New Castle
- Banquet Halls, Reception Halls & Party Facilities, New Castle
- Baptist Churches, New Castle
- Bar Supplies, Equipment & Fixtures, New Castle
- Bars, New Castle
- Bars & Grills, New Castle
- Beach & Water Related Services, New Castle
- Beauty Salons, New Castle
- Beer & Wine Stores, New Castle
- Beer Taverns, New Castle
- Beverage & Juice Bottlers Manufacturers, New Castle
- Beverage Manufacturers, New Castle
- Beverage Non-Alcoholic Manufacturers, New Castle
- Bicycle Rentals, New Castle - Bike Rental
- Bicycle Repair & Service, New Castle - Bike Repair Shops
- Bonds, New Castle
- Book Publishers, New Castle - Book Printing & Publishing
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- Bookkeeping Services Licensed, New Castle
- Bookkeeping Systems & Services, New Castle
- Bottling Manufacturing, New Castle
- Brick Masonry & Bricklayer Contractors, New Castle - Brick Mason - Install & Repair
- Builders & Contractors, New Castle
- Builders & Contractors - More, New Castle
- Building Construction Consultants, New Castle - Construction Management & Consulting
- Building Hardware & Materials, New Castle
- Building Materials, New Castle - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, New Castle
- Burglar & Alarm Service, New Castle - Monitoring Service
- Burglar Alarm Systems, New Castle
- Bus Lines, New Castle - Bus Transportation
- Bus Lines Ticket Agencies, New Castle
- Business & Professional Associations, New Castle
- Business Legal Services, New Castle
- Business Services, New Castle
- Business, Vocational & Technical, New Castle
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