- Machinery, Supplies & Equipment - Business Production Related, Sayville
- Machinery, Supplies & Equipment - Business Supplies Related, Sayville
- Mail Delivery Service, Sayville
- Mailbox Rental Services, Sayville
- Mailing, Delivery & Courier Service, Sayville
- Major Appliances, Sayville - Household & Kitchen
- Management Consultants & Services, Sayville
- Mandarin Restaurants, Sayville
- Manicurists & Pedicurists, Sayville
- Manufacturing, Sayville
- Marinas & Marina Services, Sayville
- Marine Contractors & Designers, Sayville
- Marine Products And Services, Sayville
- Marine Repair & Service Stations, Sayville
- Marine Services, Sayville
- Marine Supplies & Equipment, Sayville - Boat Supplies
- Marine Supplies & Equipment Repair, Sayville - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Sayville
- Marriage & Family Counselors, Sayville
- Martial Arts & Self Defense Schools, Sayville
- Massage Therapists & Professional, Sayville
- Massage Therapy, Sayville
- Material Handling & Heavy Machinery & Equipment, Sayville
- Material Handling Equipment, Sayville - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Sayville
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- Medical Diagnostic Clinics, Sayville - Clinical Labs & Centers
- Medical Massage, Sayville
- Mental Health Specialists, Sayville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metaphysical Churches, Sayville
- Methodist Church, Sayville
- Mexican Restaurants, Sayville
- Mirrors, Sayville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Sayville
- Miscellaneous Business Services, Sayville
- Miscellaneous Government, Sayville
- Miscellaneous Manufacturing, Sayville
- Miscellaneous Personal Services, Sayville
- Miscellaneous Photographers, Sayville
- Miscellaneous Professional, Sayville
- Moldings Materials, Sayville
- Mortgage Bankers & Correspondents, Sayville
- Motor Vehicle, Sayville
- Motor Vehicle Rental & Leasing, Sayville
- Movie Theaters, Sayville
- Moving & Storage Supplies & Equipment, Sayville
- Moving Truck Rental , Sayville
- Multimedia Publishers, Sayville - Multimedia Services & Systems
- Music, Sayville
- Musical Recording Services, Sayville
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