- Machine Shop & Tool Repair Service, Ottawa
- Machine Tool Repair & Rebuild, Ottawa
- Machinery And Equipment Manufacturers, Ottawa
- Machinery Repair & Rebuild, Ottawa
- Machinery, Supplies & Equipment - Business Supplies Related, Ottawa
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ottawa
- Mail Delivery Service, Ottawa
- Major Appliances, Ottawa - Household & Kitchen
- Mammography Clinics, Ottawa - Breast Cancer Screening
- Management Consultants & Services, Ottawa
- Manufacturing, Ottawa
- Marriage & Family Counselors, Ottawa
- Masonry Materials & Supplies, Ottawa
- Massage Therapists & Professional, Ottawa
- Massage Therapy, Ottawa
- Meat Market, Wholesale & Products, Ottawa
- Medical Diagnostic Imaging, Ottawa
- Medical Groups & Clinics, Ottawa - Medical & Health Centers
- Medical Supplies & Equipment, Ottawa
- Membership Sports & Recreation Clubs, Ottawa
- Mental Health Specialists, Ottawa - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Ottawa
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- Merle Norman Cosmetics, Ottawa
- Metal Buildings, Ottawa - Kits, Homes, Steel Buildings, etc
- Metal Products, Ottawa
- Metal Working Machinery, Ottawa
- Methodist Church, Ottawa
- Mexican & Latin American Goods & Products Stores, Ottawa
- Mexican Restaurants, Ottawa
- Millwrights, Ottawa
- Mini & Self Storage, Ottawa
- Miscellaneous Business Services, Ottawa
- Miscellaneous Government, Ottawa
- Miscellaneous Professional, Ottawa
- Mission Churches, Ottawa
- Monuments, Tombstones, Markers & Memorials, Ottawa
- Mortgage Bankers & Correspondents, Ottawa
- Motor Vehicle, Ottawa
- Motor Vehicle Rental & Leasing, Ottawa
- Motorcycle Parts, Accessories & Dealers, Ottawa
- Moving Supplies & Equipment Rental, Ottawa
- Moving Truck Rental , Ottawa
- Muffler Shop & Exhaust Systems, Ottawa
- Musical Instruments Repair, Sales & Service, Ottawa
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