- Machinery, Supplies & Equipment - Business Production Related, Outremont
- Magazine & Newspaper Stands, Outremont - Dealers & Distributors
- Management Consultants & Services, Outremont
- Manufacturing, Outremont
- Map Publishers & Printers, Outremont
- Mapping & Topographical Services, Outremont
- Maps & Globes, Outremont
- Marine Products And Services, Outremont
- Marine Services, Outremont
- Market Research & Analysis , Outremont - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Outremont
- Massage Therapy, Outremont
- Media Consultants, Outremont
- Media Research, Outremont
- Medical Supplies & Equipment, Outremont
- Meeting & Event Planning Services, Outremont - Conference Consultants
- Membership Sports & Recreation Clubs, Outremont
- Men's Clothing Stores, Outremont - Clothes & Accessories
- Mental Health Specialists, Outremont - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Outremont - Iron Works
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- Mexican Restaurants, Outremont
- Milk Bars, Outremont
- Miscellaneous Business Services, Outremont
- Miscellaneous Professional, Outremont
- Motion Picture & Television Production Services, Outremont
- Motion Picture Pre & Post Production Services, Outremont
- Motor Vehicle, Outremont
- Movie Theaters, Outremont
- Multimedia Publishers, Outremont - Multimedia Services & Systems
- Museums, Outremont
- Music, Outremont
- Music Entertainment, Outremont
- Music Lessons, Outremont
- Music Lessons - Instrumental, Outremont
- Music Publishers & Distribution, Outremont
- Music Schools, Outremont
- Music Sheet, Outremont
- Music Stores Retail, Outremont
- Musical Recording Services, Outremont
- Musicians, Bands & Disc Jockeys, Outremont
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