- Machine Shop & Tool Repair Service, Mattituck
- Machinery, Supplies & Equipment - Business Production Related, Mattituck
- Machinery, Supplies & Equipment - Business Supplies Related, Mattituck
- Machinery, Supplies & Equipment - Construction & Contractor Related, Mattituck
- Mail Delivery Service, Mattituck
- Major Appliances, Mattituck - Household & Kitchen
- Management Consultants & Services, Mattituck
- Manicurists & Pedicurists, Mattituck
- Manufacturing, Mattituck
- Manufacturing Equipment & Supplies, Mattituck
- Marinas & Marina Services, Mattituck
- Marriage & Family Counselors, Mattituck
- Masonry Contractors, Mattituck - Stone Mason, Brick Mason - Install & Repair
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- Masonry Materials & Supplies, Mattituck
- Massage Therapists & Professional, Mattituck
- Massage Therapy, Mattituck
- Medical Supplies & Equipment, Mattituck
- Membership Sports & Recreation Clubs, Mattituck
- Miscellaneous Personal Services, Mattituck
- Miscellaneous Professional, Mattituck
- Motor Vehicle, Mattituck
- Motor Vehicle Rental & Leasing, Mattituck
- Movie Theaters, Mattituck
- Moving Truck Rental , Mattituck
- Museums, Mattituck
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