- Baby & Childrens Gifts & Accessories, Catonsville
- Baby Stores, Catonsville - Baby Accessories & Clothes
- Bagels, Catonsville
- Bail Bonds, Catonsville
- Bakeries, Catonsville
- Balloons, Catonsville
- Ballroom Dance Hall, Catonsville
- Bankruptcy Attorneys & Lawyers, Catonsville
- Bankruptcy Attorneys & Lawyers, Catonsville
- Bankruptcy Lawyers & Attorneys, Catonsville
- Banks, Catonsville
- Banners, Flags, Pennants, Decals, Posters & Signs, Catonsville
- Banquet Halls, Catonsville
- Baptist Churches, Catonsville
- Bar Code Scanning Supplies & Equipment, Catonsville
- Barber Shops, Catonsville
- Barbers, Catonsville
- Bars, Catonsville
- Bars & Grills, Catonsville
- Basement Waterproofing - Waterproofing Contractors, Catonsville - Foundation & Concrete Waterproofing
- Bathroom Fixtures, Catonsville - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Catonsville - Bathroom Remodel & Planning Services
- Beach & Water Related Services, Catonsville
- Beauty Consultants, Catonsville
- Beauty Salons, Catonsville
- Bed & Breakfast, Catonsville
- Bedding & Linens Stores, Catonsville - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Bedding Manufacturers Supplies, Catonsville
- Bedroom Furniture Stores, Catonsville - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Catonsville
- Beer Taverns, Catonsville
- Beverage Stores, Catonsville
- Bible Church, Catonsville
- Bicycle Rentals, Catonsville - Bike Rental
- Bicycle Repair & Service, Catonsville - Bike Repair Shops
- Bicycle Shops, Catonsville - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billiard & Pool Parlors, Catonsville
- Bistros, Catonsville
- Blood Bank & Center, Catonsville
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- Blood Testing & Typing, Catonsville
- Boat Services, Catonsville
- Boat Storage , Catonsville - Equipment & Services
- Boating & Swimming Clubs, Catonsville
- Bonds, Catonsville
- Bonds Surety & Fidelity, Catonsville
- Book Stores, Catonsville
- Bookkeeping Services Licensed, Catonsville
- Bookkeeping Systems & Services, Catonsville
- Boot Manufacturers, Catonsville
- Boots Retail, Catonsville
- Bowling Centers, Catonsville
- Brake Service & Repair, Catonsville - Brake Pads
- Breakfast Restaurants, Catonsville
- Brick Masonry & Bricklayer Contractors, Catonsville - Brick Mason - Install & Repair
- Buffet Restaurants, Catonsville
- Builders & Contractors, Catonsville
- Builders & Contractors - More, Catonsville
- Building & Home Inspection, Catonsville - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Catonsville
- Building Construction Consultants, Catonsville - Construction Management & Consulting
- Building Hardware & Materials, Catonsville
- Building Materials, Catonsville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Catonsville
- Building Materials Commercial & Industrial, Catonsville
- Building Materials, Glass, Catonsville
- Burglar Alarm Systems, Catonsville
- Bus Rental & Charter Bus Service, Catonsville
- Business & Professional Associations, Catonsville
- Business Brokers, Catonsville
- Business Forms, Systems & Supplies, Catonsville
- Business Insurance, Catonsville
- Business Legal Services, Catonsville
- Business Machines Repair, Catonsville
- Business Management Consultants, Catonsville
- Business Services, Catonsville
- Business, Vocational & Technical, Catonsville
- Butchers & Meat Markets - Manufacturers, Catonsville
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