- Machine Shop, Lombard
- Machine Shop & Tool Repair Service, Lombard
- Machine Tools , Lombard
- Machinery And Equipment Manufacturers, Lombard
- Machinery Movers & Erectors, Lombard
- Machinery Repair & Rebuild, Lombard
- Machinery, Supplies & Equipment - Business Production Related, Lombard
- Machinery, Supplies & Equipment - Business Supplies Related, Lombard
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lombard
- Magazine & Newspaper Stands, Lombard - Dealers & Distributors
- Magnetic Devices, Lombard
- Magnets & Magnetic Devices, Lombard
- Mailbox Rental Services, Lombard
- Mailing List Service, Brokers & Compilers, Lombard
- Mailing, Delivery & Courier Service, Lombard
- Major Appliances, Lombard - Household & Kitchen
- Malls & Shopping Centers, Lombard
- Management Consultants & Services, Lombard
- Management Training & Development, Lombard
- Manicurists & Pedicurists, Lombard
- Manifold Business Forms Manufacturers, Lombard
- Manufacturers Agents & Representatives, Lombard
- Manufacturers Representative, Lombard - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Lombard
- Manufacturing Products, Lombard
- Manufacturing Services, Lombard
- Marble, Lombard
- Marble Contractors, Lombard - Installation, Cleaning & Removal Services
- Marine Electronic Equipment, Lombard
- Marine Supplies & Equipment, Lombard - Boat Supplies
- Market Research & Analysis , Lombard - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Lombard
- Marriage & Family Counselors, Lombard
- Martial Arts & Self Defense Schools, Lombard
- Masonry Contractors, Lombard - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Lombard
- Massage Therapists & Professional, Lombard
- Massage Therapy, Lombard
- Material Handling & Heavy Machinery & Equipment, Lombard
- Maytag Appliances, Lombard
- Meat Market, Wholesale & Products, Lombard
- Mechanical Contractors, Lombard - Install, Service & Repair
- Medical & Dental Management, Lombard
- Medical & Health Service Organizations, Lombard
- Medical Billing Services, Lombard
- Medical Diagnostic Clinics, Lombard - Clinical Labs & Centers
- Medical Groups & Clinics, Lombard - Medical & Health Centers
- Medical Management & Business Administration Service, Lombard
- Medical Supplies & Equipment, Lombard
- Meeting & Event Planning Services, Lombard - Conference Consultants
- Membership Sports & Recreation Clubs, Lombard
- Men's & Boys Clothing & Accessories Stores, Lombard
- Men's Clothing Stores, Lombard - Clothes & Accessories
- Mennonite Church, Lombard
- Mental Health Specialists, Lombard - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Lombard
- Metal Detecting Equipment, Lombard
- Metal Finishers, Lombard
- Metal Plating & Polishing, Lombard
- Metal Repair Service & Blacksmith, Lombard - Iron Works
- Metal Specialties, Lombard
- Metal Stampings Manufacturers, Lombard
- Metal Working Machinery, Lombard
- Methodist Church, Lombard
- Mexican Restaurants, Lombard
- Micrometers, Lombard
- Middle Eastern Restaurants, Lombard
- Military Supplies, Lombard
- Mini & Self Storage, Lombard
- Miscellaneous Household Item Repair, Lombard
- Miscellaneous Prosthesis & Appliances, Lombard
- Miscellaneous Business Services, Lombard
- Miscellaneous Government, Lombard
- Miscellaneous Industry, Lombard
- Miscellaneous Manufacturing, Lombard
- Miscellaneous Metal Work Manufacturers, Lombard
- Miscellaneous Personal Services, Lombard
- Miscellaneous Photographers, Lombard
- Miscellaneous Professional, Lombard
- Mission Churches, Lombard
- Modular & Mobile Homes For Sale, Lombard - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Lombard
- Mortgage Brokers, Lombard
- Mortgage Companies, Lombard
- Mortgages & Loans, Lombard
- Motion Picture & Television Production Services, Lombard
- Motion Picture Pre & Post Production Services, Lombard
- Motor Vehicle, Lombard
- Motor Vehicle Rental & Leasing, Lombard
- Motorcycle & Motor Scooters Dealers, Repair & Service, Lombard
- Motorcycle Parts, Accessories & Dealers, Lombard
- Motorcycle Repair & Service, Lombard
- Movie Theaters, Lombard
- Moving & Storage Supplies & Equipment, Lombard
- Moving Companies, Lombard
- Moving Services - Labor & Material, Lombard
- Moving Supplies & Equipment Rental, Lombard
- Moving Truck Rental , Lombard
- Muffler Shop & Exhaust Systems, Lombard
- Mulch, Peat & Moss Products, Lombard
- Multimedia Publishers, Lombard - Multimedia Services & Systems
- Music, Lombard
- Music Entertainment, Lombard
- Musical Instrument Manufacturers, Lombard
- Musical Instrument Rental, Lombard - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Lombard
- Musical Instruments Repair, Sales & Service, Lombard
- Musical Instruments Supplies & Accessories Manufacturers, Lombard
- Musicians, Bands & Disc Jockeys, Lombard
- Myofunctional Therapy, Lombard
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