- Machinery, Supplies & Equipment - Business Production Related, Old Greenwich
- Machinery, Supplies & Equipment - Business Supplies Related, Old Greenwich
- Machinery, Supplies & Equipment - Construction & Contractor Related, Old Greenwich
- Magicians & Hypnotist Entertainers, Old Greenwich
- Major Appliances, Old Greenwich - Household & Kitchen
- Management Consultants & Services, Old Greenwich
- Manufacturing, Old Greenwich
- Marble, Old Greenwich
- Marinas & Marina Services, Old Greenwich
- Market Research & Analysis , Old Greenwich - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Old Greenwich
- Martial Arts & Self Defense Schools, Old Greenwich
- Masonry Materials & Supplies, Old Greenwich
- Meeting & Event Planning Services, Old Greenwich - Conference Consultants
- Membership Sports & Recreation Clubs, Old Greenwich
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- Mental Health Specialists, Old Greenwich - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Old Greenwich
- Miscellaneous Agriculture, Old Greenwich
- Miscellaneous Government, Old Greenwich
- Miscellaneous Personal Services, Old Greenwich
- Miscellaneous Photographers, Old Greenwich
- Miscellaneous Professional, Old Greenwich
- Mortgage Bankers & Correspondents, Old Greenwich
- Mortgages & Loans, Old Greenwich
- Motion Picture Pre & Post Production Services, Old Greenwich
- Motor Vehicle, Old Greenwich
- Music, Old Greenwich
- Music Publishers & Distribution, Old Greenwich
- Music Sheet, Old Greenwich
- Music Stores Retail, Old Greenwich
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