- Machine Shop & Tool Repair Service, Ottawa
- Machinery Movers & Erectors, Ottawa
- Machinery Repair & Rebuild, Ottawa
- Machinery, Supplies & Equipment - Business Production Related, Ottawa
- Machinery, Supplies & Equipment - Business Supplies Related, Ottawa
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ottawa
- Mailbox Rental Services, Ottawa
- Mailing, Delivery & Courier Service, Ottawa
- Major Appliances, Ottawa - Household & Kitchen
- Malpractice Attorneys & Lawyers, Ottawa
- Manicurists & Pedicurists, Ottawa
- Manufacturing, Ottawa
- Manufacturing Products, Ottawa
- Marinas & Marina Services, Ottawa
- Marriage & Family Counselors, Ottawa
- Martial Arts & Self Defense Schools, Ottawa
- Mary Kay Cosmetics, Ottawa
- Masonry Materials & Supplies, Ottawa
- Material Handling Equipment, Ottawa - Conveyor Belt, Pallet Jack, Forklift, etc
- Mausoleum Builders, Ottawa
- Mausoleums Developers, Ottawa
- Meat Market, Wholesale & Products, Ottawa
- Medical Diagnostic Clinics, Ottawa - Clinical Labs & Centers
- Medical Supplies & Equipment, Ottawa
- Membership Sports & Recreation Clubs, Ottawa
- Men's Clothing Stores, Ottawa - Clothes & Accessories
- Mental Health Clinics, Ottawa - Treatment Centers
- Mental Health Specialists, Ottawa - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Ottawa
- Metal Buildings, Ottawa - Kits, Homes, Steel Buildings, etc
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- Metal Working Machinery, Ottawa
- Methodist Church, Ottawa
- Mexican Restaurants, Ottawa
- Minerals, Ottawa
- Mini & Self Storage, Ottawa
- Miscellaneous Household Item Repair, Ottawa
- Miscellaneous Agriculture, Ottawa
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Ottawa
- Miscellaneous Government, Ottawa
- Miscellaneous Industry, Ottawa
- Miscellaneous Personal Services, Ottawa
- Miscellaneous Photographers, Ottawa
- Miscellaneous Professional, Ottawa
- Mobile Home Contractors, Ottawa
- Mobile Home Improvements & Repairs, Ottawa
- Modular & Mobile Homes For Sale, Ottawa - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Ottawa
- Mortgages & Loans, Ottawa
- Motion Picture & Television Production Services, Ottawa
- Motor Vehicle, Ottawa
- Motor Vehicle Rental & Leasing, Ottawa
- Motorcycle Parts, Accessories & Dealers, Ottawa
- Moving & Storage Supplies & Equipment, Ottawa
- Moving Companies, Ottawa
- Moving Supplies & Equipment Rental, Ottawa
- Moving Truck Rental , Ottawa
- Museums, Ottawa
- Music, Ottawa
- Music Lessons, Ottawa
- Music Lessons - Instrumental, Ottawa
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