- Machine Shop, Longueuil
- Machine Shop & Tool Repair Service, Longueuil
- Machine Tool Repair & Rebuild, Longueuil
- Machinery And Equipment Manufacturers, Longueuil
- Machinery Custom Design Manufacturers, Longueuil
- Machinery, Supplies & Equipment - Business Production Related, Longueuil
- Machinery, Supplies & Equipment - Business Supplies Related, Longueuil
- Machinery, Supplies & Equipment - Construction & Contractor Related, Longueuil
- Magazine & Newspaper Stands, Longueuil - Dealers & Distributors
- Magicians & Hypnotist Entertainers, Longueuil
- Mailing, Delivery & Courier Service, Longueuil
- Maintenance, Cleaning & Sanitation, Longueuil
- Major Appliances, Longueuil - Household & Kitchen
- Make Up & Cosmetics Application, Longueuil
- Malls & Shopping Centers, Longueuil
- Management Consultants & Services, Longueuil
- Manicurists & Pedicurists, Longueuil
- Manufacturers Agents & Representatives, Longueuil
- Manufacturers Representative, Longueuil - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Longueuil
- Manufacturing & Industrial Consultants, Longueuil
- Manufacturing Equipment & Supplies, Longueuil
- Manufacturing Products, Longueuil
- Marinas & Marina Services, Longueuil
- Marine Products And Services, Longueuil
- Marine Services, Longueuil
- Marketing, Longueuil
- Markets & Grocers Equipment, Longueuil
- Marking Device Equipment & Supplies, Longueuil
- Marking, Stamping & Engraving Equipment, Longueuil
- Marriage & Family Counselors, Longueuil
- Martial Arts & Self Defense Schools, Longueuil
- Masonry Contractors, Longueuil - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Longueuil
- Massage Therapy, Longueuil
- Mastectomy Apparel, Forms, Prostheses & Supplies, Longueuil
- Material Handling & Heavy Machinery & Equipment, Longueuil
- Material Handling Equipment, Longueuil - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Longueuil - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Longueuil
- Mechanical Contractors, Longueuil - Install, Service & Repair
- Media Consultants, Longueuil
- Media Research, Longueuil
- Medical Groups & Clinics, Longueuil - Medical & Health Centers
- Medical Supplies & Equipment, Longueuil
- Meeting & Event Planning Services, Longueuil - Conference Consultants
- Membership Sports & Recreation Clubs, Longueuil
- Men's & Boys Clothing & Accessories Stores, Longueuil
- Men's Clothing Stores, Longueuil - Clothes & Accessories
- Mental Health Specialists, Longueuil - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Longueuil
- Messenger Service, Longueuil - Message Receiving & Forwarding Service
- Metal Coating & Allied Services, Longueuil
- Metal Heat Treating, Longueuil
- Metal Plating & Polishing, Longueuil
- Metal Polishing & Buffing, Longueuil
- Metal Products, Longueuil
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- Metal Repair Service & Blacksmith, Longueuil - Iron Works
- Metal Tanks, Longueuil
- Metal Working Machinery, Longueuil
- Mexican Restaurants, Longueuil
- Middle Eastern Restaurants, Longueuil
- Mildew Removal & Control, Longueuil - Mold Removal
- Milk & Milk Products, Longueuil
- Milk Bars, Longueuil
- Millwork Manufacturers, Longueuil
- Mini & Self Storage, Longueuil
- Mini Golf Courses, Longueuil
- Mining, Longueuil
- Mining Consultants, Longueuil
- Mining Contractors, Longueuil - Mining Companies, Contractors & Brokers
- Mining Development & Exploration, Longueuil
- Mining Services, Longueuil
- Mining, Crude-Oil Production, Longueuil - Mining Companies
- Mirrors, Longueuil - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Longueuil
- Miscellaneous Agriculture, Longueuil
- Miscellaneous Business Services, Longueuil
- Miscellaneous Industry, Longueuil
- Miscellaneous Manufacturing, Longueuil
- Miscellaneous Personal Services, Longueuil
- Miscellaneous Professional, Longueuil
- Modular & Mobile Homes For Sale, Longueuil - Manufactured Homes Sale & Service
- Molds, Longueuil
- Molds Manufacturers, Longueuil
- Monuments, Tombstones, Markers & Memorials, Longueuil
- Mortgage Bankers & Correspondents, Longueuil
- Mortgage Brokers, Longueuil
- Mortgages & Loans, Longueuil
- Mosquito Control, Longueuil
- Motion Picture & Television Production Services, Longueuil
- Motion Picture Pre & Post Production Services, Longueuil
- Motor Vehicle, Longueuil
- Motor Vehicle Rental & Leasing, Longueuil
- Motorcycle Parts, Accessories & Dealers, Longueuil
- Motors & Bearings, Longueuil
- Movie Theaters, Longueuil
- Moving & Storage Supplies & Equipment, Longueuil
- Moving Companies, Longueuil
- Moving Truck Rental , Longueuil
- Muffler Shop & Exhaust Systems, Longueuil
- Multimedia Publishers, Longueuil - Multimedia Services & Systems
- Murals & Faux Finish Walls, Longueuil
- Museums, Longueuil
- Music, Longueuil
- Music Entertainment, Longueuil
- Music Lessons, Longueuil
- Music Lessons - Instrumental, Longueuil
- Music Publishers & Distribution, Longueuil
- Musical Instrument Manufacturers, Longueuil
- Musical Instruments & Equipment Stores, Longueuil
- Musical Instruments Repair, Sales & Service, Longueuil
- Musical Recording Services, Longueuil
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