- Baby Stores, Monrovia - Baby Accessories & Clothes
- Badges & Buttons, Monrovia
- Bail Bonds, Monrovia
- Bakeries, Monrovia
- Bank Supplies & Equipment, Monrovia
- Bankruptcy Attorneys & Lawyers, Monrovia
- Bankruptcy Attorneys & Lawyers, Monrovia
- Bankruptcy Lawyers & Attorneys, Monrovia
- Banks, Monrovia
- Banquet Halls, Monrovia
- Banquet Halls, Reception Halls & Party Facilities, Monrovia
- Baptist Churches, Monrovia
- Bar Supplies, Equipment & Fixtures, Monrovia
- Barbecue Restaurants, Monrovia
- Barber Shops, Monrovia
- Barbers, Monrovia
- Bars, Monrovia
- Bars & Grills, Monrovia
- Barter & Trade Exchanges, Monrovia
- Bathroom Fixtures, Monrovia - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Monrovia - Bathroom Remodel & Planning Services
- Battery, Monrovia - Retail Batteries Stores
- Battery Storage, Monrovia
- Battery Stores, Monrovia
- Bearings, Monrovia
- Beauty Consultants, Monrovia
- Beauty Salons, Monrovia
- Bedroom Furniture Stores, Monrovia - Master & Kids Bedroom Furniture Sets & Beds
- Bee Control & Removal Services, Monrovia - Bee Removal Companies
- Beer & Wine Stores, Monrovia
- Beverage Stores, Monrovia
- Bicycle Rentals, Monrovia - Bike Rental
- Bicycle Repair & Service, Monrovia - Bike Repair Shops
- Bicycle Shops, Monrovia - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Bill Payment Service, Monrovia
- Billing Services, Monrovia
- Bins Storage, Monrovia
- Biological Research, Monrovia - Biological Labs
- Biotechnology Products & Services, Monrovia
- Bistros, Monrovia
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- Blacksmiths, Monrovia
- Blueprint Service, Monrovia - Blueprinting Services
- Boats & Yachts, Monrovia - Yachts, Sailboats & Boats for Sale
- Book Publishers, Monrovia - Book Printing & Publishing
- Book Stores, Monrovia
- Bookkeeping Services Commercial, Monrovia
- Bookkeeping Services Licensed, Monrovia
- Bookkeeping Systems & Services, Monrovia
- Brake Service & Repair, Monrovia - Brake Pads
- Brakes & Brake Parts, Monrovia - Brake Pads, Rotors, Calipers, Lines, etc
- Breakfast Restaurants, Monrovia
- Brick Masonry & Bricklayer Contractors, Monrovia - Brick Mason - Install & Repair
- Broker Consultants, Monrovia - Business Coaches & Consultants
- Buckles Retail, Monrovia
- Buddhist Churches, Monrovia
- Buffet Restaurants, Monrovia
- Builders & Contractors, Monrovia
- Builders & Contractors - More, Monrovia
- Building & Home Inspection, Monrovia - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Monrovia
- Building Construction Consultants, Monrovia - Construction Management & Consulting
- Building Equipment Installation Contractors, Monrovia
- Building Hardware & Materials, Monrovia
- Building Materials, Monrovia - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Monrovia
- Bulk Food Stores, Monrovia
- Burglar & Alarm Service, Monrovia - Monitoring Service
- Burglar Alarm Systems, Monrovia
- Business & Professional Associations, Monrovia
- Business & Trade Organizations, Monrovia
- Business Brokers, Monrovia
- Business Communication Consultants, Monrovia
- Business Forms, Systems & Supplies, Monrovia
- Business Insurance, Monrovia
- Business Legal Services, Monrovia
- Business Management Consultants, Monrovia
- Business Services, Monrovia
- Business Wholesale, Monrovia
- Business, Vocational & Technical, Monrovia
- Butchers & Meat Markets - Manufacturers, Monrovia
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