- Machinery, Supplies & Equipment - Business Production Related, Locust Valley
- Machinery, Supplies & Equipment - Construction & Contractor Related, Locust Valley
- Mail Delivery Service, Locust Valley
- Management Consultants & Services, Locust Valley
- Manicurists & Pedicurists, Locust Valley
- Manufacturing, Locust Valley
- Marketing Consultants Professional Practices, Locust Valley
- Masonry Contractors, Locust Valley - Stone Mason, Brick Mason - Install & Repair
- Medical Supplies & Equipment, Locust Valley
- Mental Health Specialists, Locust Valley - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Locust Valley - Iron Works
- Mexican Restaurants, Locust Valley
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- Miscellaneous Household Item Repair, Locust Valley
- Miscellaneous Government, Locust Valley
- Miscellaneous Personal Services, Locust Valley
- Miscellaneous Photographers, Locust Valley
- Miscellaneous Professional, Locust Valley
- Modular Buildings, Locust Valley - Modular Homes Buildings & Offices
- Mortgage Bankers & Correspondents, Locust Valley
- Motor Vehicle, Locust Valley
- Moving Companies, Locust Valley
- Museums, Locust Valley
- Music, Locust Valley
- Musical Recording Services, Locust Valley
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