- Machine Shop & Tool Repair Service, Louiseville
- Machine Tools , Louiseville
- Machinery And Equipment Manufacturers, Louiseville
- Machinery Custom Design Manufacturers, Louiseville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Louiseville
- Major Appliances, Louiseville - Household & Kitchen
- Management Consultants & Services, Louiseville
- Manufacturing, Louiseville
- Masonry Contractors, Louiseville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Louiseville
- Massage Therapy, Louiseville
- Mastectomy Apparel, Forms, Prostheses & Supplies, Louiseville
- Medical Supplies & Equipment, Louiseville
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- Membership Sports & Recreation Clubs, Louiseville
- Mens & Womens Clothing, Louiseville
- Mental Health Specialists, Louiseville - Psychologist, Psychiatrist, Psychotherapist, etc
- Milk & Milk Products, Louiseville
- Mini & Self Storage, Louiseville
- Miscellaneous Business Services, Louiseville
- Miscellaneous Professional, Louiseville
- Modular & Mobile Homes For Sale, Louiseville - Manufactured Homes Sale & Service
- Motor Vehicle, Louiseville
- Motor Vehicle Rental & Leasing, Louiseville
- Motorcycle Parts, Accessories & Dealers, Louiseville
- Moving Companies, Louiseville
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