- Babbitting Metals, Naperville
- Baby & Childrens Gifts & Accessories, Naperville
- Baby Stores, Naperville - Baby Accessories & Clothes
- Back Care Products, Naperville
- Bagel Restaurants, Naperville
- Bagels, Naperville
- Baha'i Church, Naperville
- Baker Equipment & Supplies, Naperville - Donut Maker, etc
- Bakeries, Naperville
- Baking Supplies & Needs, Naperville - Flavoring Extracts, Flour & More
- Balloons - Novelty, Toy & Decorative, Naperville
- Banking Attorneys & Lawyers, Naperville
- Banking Attorneys & Lawyers, Naperville
- Banking Lawyers & Attorneys, Naperville
- Bankruptcy Attorneys & Lawyers, Naperville
- Bankruptcy Attorneys & Lawyers, Naperville
- Bankruptcy Lawyers & Attorneys, Naperville
- Banks, Naperville
- Banners, Flags, Pennants, Decals, Posters & Signs, Naperville
- Banquet Halls, Naperville
- Baptist Churches, Naperville
- Bar Code Scanning Supplies & Equipment, Naperville
- Barbecue Restaurants, Naperville
- Barber Shops, Naperville
- Barbers, Naperville
- Bars, Naperville
- Bars & Grills, Naperville
- Baseball & Softball Batting Ranges, Naperville
- Baseball & Softball Clubs, Naperville
- Baseball & Softball Instruction, Naperville
- Baseball Little Leagues, Naperville
- Basement Waterproofing - Waterproofing Contractors, Naperville - Foundation & Concrete Waterproofing
- Basketball Clubs & Instruction, Naperville
- Bathing Accessories, Naperville
- Bathroom Fixtures, Naperville - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Naperville - Bathroom Remodel & Planning Services
- Batteries Dry Cell Manufacturers, Naperville
- Batteries Dry Cell Wholesale, Naperville
- Batteries Storage Manufacturers, Naperville
- Battery, Naperville - Retail Batteries Stores
- Battery Manufacturers, Naperville
- Battery Storage, Naperville
- Battery Stores, Naperville
- Beach & Water Related Services, Naperville
- Beauty Salons, Naperville
- Bed Parts & Frames Metal Wood & Other, Naperville
- Bedding & Linens Stores, Naperville - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Bedding Manufacturers Supplies, Naperville
- Bedroom Furniture Stores, Naperville - Master & Kids Bedroom Furniture Sets & Beds
- Bee Control & Removal Services, Naperville - Bee Removal Companies
- Beef Restaurants, Naperville
- Beer & Wine Stores, Naperville
- Beer Taverns, Naperville
- Beverage Stores, Naperville
- Bible Church, Naperville
- Bicycle Equipment & Clothing, Naperville
- Bicycle Parts & Accessories, Naperville
- Bicycle Rentals, Naperville - Bike Rental
- Bicycle Repair & Service, Naperville - Bike Repair Shops
- Bicycle Shops, Naperville - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Big & Tall Men's Clothing, Naperville
- Billing Services, Naperville
- Biotechnology, Naperville
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- Bird Repellent, Barrier & Control, Naperville
- Bistros, Naperville
- Blood Bank & Center, Naperville
- Blowers & Fans Manufacturers, Naperville
- Blueprint Service, Naperville - Blueprinting Services
- Boating & Swimming Clubs, Naperville
- Boats & Yachts, Naperville - Yachts, Sailboats & Boats for Sale
- Boiler & Furnace Contractors, Naperville - Installation, Cleaning & Repair Services
- Boiler Distributors & Manufacturers, Naperville
- Boiler Repair & Cleaning, Naperville
- Bonds, Naperville
- Book Binding, Naperville
- Book Publishers, Naperville - Book Printing & Publishing
- Book Stores, Naperville
- Bookkeeping Services Licensed, Naperville
- Bookkeeping Systems & Services, Naperville
- Books, Magazines & Newspapers Stores, Naperville - Bookstores
- Boutiques & Boutique Items, Naperville
- Bowling Centers, Naperville
- Boxing Clubs & Instruction, Naperville
- Brake Service & Repair, Naperville - Brake Pads
- Brakes & Brake Parts, Naperville - Brake Pads, Rotors, Calipers, Lines, etc
- Breakfast Restaurants, Naperville
- Brew Pubs, Naperville
- Brick Masonry & Bricklayer Contractors, Naperville - Brick Mason - Install & Repair
- Brick Pavers, Naperville
- Bricks, Blocks & Stone Products, Naperville - Companies, Wholesale, Manufacturers & Suppliers
- Bridal Wear Supplies Wholesale & Manufacturers, Naperville
- Brooms & Brushes Manufacturers, Naperville
- Buddhist Churches, Naperville
- Builders & Contractors, Naperville
- Builders & Contractors - More, Naperville
- Builders Hardware Stores, Naperville
- Building & Home Inspection, Naperville - Real Estate, Building, Land & House Inspection Service
- Building & Land Inspection Service, Naperville
- Building & Property Maintenance & Services, Naperville
- Building Construction Consultants, Naperville - Construction Management & Consulting
- Building Design & Construction Consultants, Naperville
- Building Hardware & Materials, Naperville
- Building Materials, Naperville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Naperville
- Building Materials, Glass, Naperville
- Building Restoration & Preservation, Naperville
- Buildings, Naperville
- Burglar & Alarm Service, Naperville - Monitoring Service
- Burglar Alarm Systems, Naperville
- Bus Lines, Naperville - Bus Transportation
- Bus Lines Ticket Agencies, Naperville
- Bus Rental & Charter Bus Service, Naperville
- Business & Professional Associations, Naperville
- Business & Trade Organizations, Naperville
- Business Brokers, Naperville
- Business Colleges, Naperville
- Business Communication Consultants, Naperville
- Business Forms, Systems & Supplies, Naperville
- Business Insurance, Naperville
- Business Legal Services, Naperville
- Business Management Consultants, Naperville
- Business Services, Naperville
- Business Studio Rental, Naperville
- Business, Vocational & Technical, Naperville
- Buyers Information Services, Naperville
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