- Machinery, Supplies & Equipment - Business Supplies Related, Katonah
- Machinery, Supplies & Equipment - Construction & Contractor Related, Katonah
- Management Consultants & Services, Katonah
- Manicurists & Pedicurists, Katonah
- Manufacturing, Katonah
- Marble, Katonah
- Marble Contractors, Katonah - Installation, Cleaning & Removal Services
- Marriage & Family Counselors, Katonah
- Masonry Contractors, Katonah - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Katonah
- Meat Market, Wholesale & Products, Katonah
- Medical Groups & Clinics, Katonah - Medical & Health Centers
- Mental Health Clinics, Katonah - Treatment Centers
- Mental Health Specialists, Katonah - Psychologist, Psychiatrist, Psychotherapist, etc
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- Methodist Church, Katonah
- Mirrors, Katonah - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Katonah
- Miscellaneous Government, Katonah
- Miscellaneous Industry, Katonah
- Miscellaneous Personal Services, Katonah
- Miscellaneous Professional, Katonah
- Mortgage Bankers & Correspondents, Katonah
- Mortgages & Loans, Katonah
- Motion Picture Pre & Post Production Services, Katonah
- Motor Vehicle, Katonah
- Museums, Katonah
- Music, Katonah
- Musical Recording Services, Katonah
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