- Machine Shop & Tool Repair Service, Oyster Bay
- Machine Shop Rotary Surface Grinding, Oyster Bay - Tool Grinding & Sharpening
- Machinery Rebuilt & Used, Oyster Bay
- Machinery, Supplies & Equipment - Business Production Related, Oyster Bay
- Machinery, Supplies & Equipment - Business Supplies Related, Oyster Bay
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oyster Bay
- Mail Delivery Service, Oyster Bay
- Management Consultants & Services, Oyster Bay
- Manicurists & Pedicurists, Oyster Bay
- Manufacturing, Oyster Bay
- Marinas & Marina Services, Oyster Bay
- Marine Products And Services, Oyster Bay
- Marine Repair & Service Stations, Oyster Bay
- Marine Services, Oyster Bay
- Marine Supplies & Equipment, Oyster Bay - Boat Supplies
- Marine Supplies & Equipment Repair, Oyster Bay - Boat Supplies & Equipment
- Marketing Consultants Professional Practices, Oyster Bay
- Marriage & Family Counselors, Oyster Bay
- Martial Arts & Self Defense Schools, Oyster Bay
- Masonry Contractors, Oyster Bay - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Oyster Bay
- Massage Therapy, Oyster Bay
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- Medical Billing Services, Oyster Bay
- Medical Supplies & Equipment, Oyster Bay
- Membership Sports & Recreation Clubs, Oyster Bay
- Mental Health Clinics, Oyster Bay - Treatment Centers
- Mental Health Specialists, Oyster Bay - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Oyster Bay
- Miscellaneous Household Item Repair, Oyster Bay
- Miscellaneous Business Services, Oyster Bay
- Miscellaneous Government, Oyster Bay
- Miscellaneous Jewelry, Oyster Bay
- Miscellaneous Personal Services, Oyster Bay
- Miscellaneous Professional, Oyster Bay
- Mobile Homes, Oyster Bay
- Mobile Homes Manufactures, Oyster Bay
- Mosquito Control, Oyster Bay
- Motor Vehicle, Oyster Bay
- Motorcycle Parts, Accessories & Dealers, Oyster Bay
- Moving Companies, Oyster Bay
- Muffler Shop & Exhaust Systems, Oyster Bay
- Museums, Oyster Bay
- Music, Oyster Bay
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