- Baby Stores, Janesville - Baby Accessories & Clothes
- Bagel Restaurants, Janesville
- Bagels, Janesville
- Baha'i Church, Janesville
- Baked Goods, Snacks & Sweets, Janesville
- Bakeries, Janesville
- Baking Supplies & Needs, Janesville - Flavoring Extracts, Flour & More
- Bankruptcy Attorneys & Lawyers, Janesville
- Bankruptcy Attorneys & Lawyers, Janesville
- Bankruptcy Lawyers & Attorneys, Janesville
- Bankruptcy Services, Janesville
- Banks, Janesville
- Banners, Flags, Pennants, Decals, Posters & Signs, Janesville
- Banquet Halls, Janesville
- Banquet Halls, Reception Halls & Party Facilities, Janesville
- Baptist Churches, Janesville
- Barber Schools, Janesville
- Barber Shop & Beauty Salon Supplies & Equipment, Janesville - Beauty & Barber Supplies
- Barber Shops, Janesville
- Barbers, Janesville
- Bars, Janesville
- Bars & Grills, Janesville
- Baseball Cards & Sports Memorabilia, Janesville
- Bath Equipment & Supplies, Janesville
- Bathroom Fixtures, Janesville - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Janesville - Bathroom Remodel & Planning Services
- Batteries Dry Cell Manufacturers, Janesville
- Batteries Dry Cell Wholesale, Janesville
- Batteries Storage Manufacturers, Janesville
- Battery, Janesville - Retail Batteries Stores
- Battery Manufacturers, Janesville
- Battery Storage, Janesville
- Battery Stores, Janesville
- Bearings, Janesville
- Beauty Cosmetic & Salon Equipment & Supplies Manufacturers, Janesville
- Beauty Salons, Janesville
- Bed Parts & Frames Metal Wood & Other, Janesville
- Bedding & Linens Stores, Janesville - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Bedding Manufacturers Supplies, Janesville
- Bedroom Furniture Stores, Janesville - Master & Kids Bedroom Furniture Sets & Beds
- Bee Control & Removal Services, Janesville - Bee Removal Companies
- Beer & Wine Stores, Janesville
- Beer Taverns, Janesville
- Beverage Stores, Janesville
- Beverages, Janesville
- Bible Church, Janesville
- Bible Study Schools, Janesville
- Bibles Retail, Janesville
- Bicycle Rentals, Janesville - Bike Rental
- Bicycle Repair & Service, Janesville - Bike Repair Shops
- Bicycle Shops, Janesville - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billiard Supplies & Equipment, Janesville - Pool Table
- Billing Services, Janesville
- Bird Feeders & Supplies, Janesville
- Bistros, Janesville
- Blind Organizations, Janesville
- Blind Services & Facilities, Janesville
- Blood Bank & Center, Janesville
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- Blueprint Service, Janesville - Blueprinting Services
- Board Up Services Contractors, Janesville
- Boat Covers, Tops & Upholstery, Janesville
- Boat Services, Janesville
- Boat Storage , Janesville - Equipment & Services
- Boats & Yachts, Janesville - Yachts, Sailboats & Boats for Sale
- Boiler Repair & Cleaning, Janesville
- Boiler Supplies & Equipment, Janesville - Water Heaters & Boilers
- Bonds, Janesville
- Bonds Surety & Fidelity, Janesville
- Book Publishers, Janesville - Book Printing & Publishing
- Book Stores, Janesville
- Bookkeeping Services Commercial, Janesville
- Bookkeeping Services Licensed, Janesville
- Bookkeeping Systems & Services, Janesville
- Books, Magazines & Newspapers Stores, Janesville - Bookstores
- Boot Manufacturers, Janesville
- Boots Retail, Janesville
- Botanical & Zoological Gardens, Janesville
- Boutiques & Boutique Items, Janesville
- Bowling Centers, Janesville
- Brake Lining Manufacturers, Janesville
- Brake Service & Repair, Janesville - Brake Pads
- Brakes & Brake Parts, Janesville - Brake Pads, Rotors, Calipers, Lines, etc
- Breakfast Nooks & Booths, Janesville
- Breakfast Restaurants, Janesville
- Breast Feeding Information & Supplies, Janesville
- Breast Pumps Sales & Rentals, Janesville
- Brick Clay Common Face, Janesville
- Brick Masonry & Bricklayer Contractors, Janesville - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Janesville - Companies, Wholesale, Manufacturers & Suppliers
- Brooms & Brushes Manufacturers, Janesville
- Buffet Restaurants, Janesville
- Builders & Contractors, Janesville
- Builders & Contractors - More, Janesville
- Builders Hardware Stores, Janesville
- Building & Property Maintenance & Services, Janesville
- Building Cleaning - Exterior, Janesville - Cleaning Service
- Building Construction Consultants, Janesville - Construction Management & Consulting
- Building Design & Construction Consultants, Janesville
- Building Hardware & Materials, Janesville
- Building Materials, Janesville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Janesville
- Building Materials, Glass, Janesville
- Burglar & Alarm Service, Janesville - Monitoring Service
- Burglar Alarm Systems, Janesville
- Bus Lines, Janesville - Bus Transportation
- Bus Lines Ticket Agencies, Janesville
- Bus Rental & Charter Bus Service, Janesville
- Business & Professional Associations, Janesville
- Business & Trade Organizations, Janesville
- Business Brokers, Janesville
- Business Communication Consultants, Janesville
- Business Insurance, Janesville
- Business Legal Services, Janesville
- Business Management Consultants, Janesville
- Business Services, Janesville
- Business, Vocational & Technical, Janesville
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