- Baby Stores, South Portland - Baby Accessories & Clothes
- Bakeries, South Portland
- Balloons - Novelty, Toy & Decorative, South Portland
- Banks, South Portland
- Banners, Flags, Pennants, Decals, Posters & Signs, South Portland
- Baptist Churches, South Portland
- Barbecue Restaurants, South Portland
- Barbers, South Portland
- Bars & Grills, South Portland
- Battery, South Portland - Retail Batteries Stores
- Battery Storage, South Portland
- Beauty Salons, South Portland
- Bed Parts & Frames Metal Wood & Other, South Portland
- Bedding & Linens Stores, South Portland - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Bedroom Furniture Stores, South Portland - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, South Portland
- Beverage Dispenser Supplies & Equipment , South Portland - Beverage Dispensing
- Beverage Manufacturers, South Portland
- Beverage Stores, South Portland
- Bicycle Rentals, South Portland - Bike Rental
- Bicycle Repair & Service, South Portland - Bike Repair Shops
- Big & Tall Men's Clothing, South Portland
- Bingo Halls, Supplies & Equipment, South Portland
- Bird Feeders & Supplies, South Portland
- Boat Fishing Charters & Tours, South Portland
- Boat Services, South Portland
- Boat Storage , South Portland - Equipment & Services
- Boats & Yachts, South Portland - Yachts, Sailboats & Boats for Sale
- Boiler & Furnace Contractors, South Portland - Installation, Cleaning & Repair Services
- Bonds, South Portland
- Book Publishers, South Portland - Book Printing & Publishing
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- Book Stores, South Portland
- Bookkeeping Services Licensed, South Portland
- Bookkeeping Systems & Services, South Portland
- Books, Magazines & Newspapers Stores, South Portland - Bookstores
- Boot & Shoe Repair, South Portland
- Boot Manufacturers, South Portland
- Boots Retail, South Portland
- Bottled Gas, Lp Gas & Propane Dealers, South Portland
- Boutiques & Boutique Items, South Portland
- Brake Service & Repair, South Portland - Brake Pads
- Brass & Brass Products, South Portland
- Breakfast Restaurants, South Portland
- Brick Masonry & Bricklayer Contractors, South Portland - Brick Mason - Install & Repair
- Buffet Restaurants, South Portland
- Builders & Contractors, South Portland
- Builders & Contractors - More, South Portland
- Building & Property Maintenance & Services, South Portland
- Building Construction Consultants, South Portland - Construction Management & Consulting
- Building Design & Construction Consultants, South Portland
- Building Hardware & Materials, South Portland
- Building Materials, South Portland - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, South Portland
- Business & Professional Associations, South Portland
- Business & Trade Organizations, South Portland
- Business Development, South Portland
- Business Insurance, South Portland
- Business Legal Services, South Portland
- Business Management Consultants, South Portland
- Business Planning & Organizing, South Portland
- Business Services, South Portland
- Business, Vocational & Technical, South Portland
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