- Machinery, Supplies & Equipment - Business Production Related, Holtsville
- Machinery, Supplies & Equipment - Business Supplies Related, Holtsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Holtsville
- Malls & Shopping Centers, Holtsville
- Management Consultants & Services, Holtsville
- Manicurists & Pedicurists, Holtsville
- Manufacturers Agents & Representatives, Holtsville
- Manufacturers Representative, Holtsville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Holtsville
- Marble Contractors, Holtsville - Installation, Cleaning & Removal Services
- Marketing Consultants Professional Practices, Holtsville
- Marriage & Family Counselors, Holtsville
- Martial Arts & Self Defense Schools, Holtsville
- Masonry Contractors, Holtsville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Holtsville
- Medical Billing Services, Holtsville
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- Membership Sports & Recreation Clubs, Holtsville
- Mental Health Specialists, Holtsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Holtsville
- Mini & Self Storage, Holtsville
- Miscellaneous Household Item Repair, Holtsville
- Miscellaneous Government, Holtsville
- Miscellaneous Manufacturing, Holtsville
- Miscellaneous Photographers, Holtsville
- Miscellaneous Professional, Holtsville
- Motor Vehicle, Holtsville
- Motor Vehicle Rental & Leasing, Holtsville
- Movie Theaters, Holtsville
- Moving Companies, Holtsville
- Moving Supplies & Equipment Rental, Holtsville
- Moving Truck Rental , Holtsville
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