- Machinery, Supplies & Equipment - Business Production Related, Center Moriches
- Machinery, Supplies & Equipment - Business Supplies Related, Center Moriches
- Machinery, Supplies & Equipment - Construction & Contractor Related, Center Moriches
- Mail Delivery Service, Center Moriches
- Major Appliances, Center Moriches - Household & Kitchen
- Management Consultants & Services, Center Moriches
- Manicurists & Pedicurists, Center Moriches
- Manufacturing, Center Moriches
- Manufacturing Products, Center Moriches
- Marinas & Marina Services, Center Moriches
- Marine Contractors & Designers, Center Moriches
- Marine Products And Services, Center Moriches
- Marine Repair & Service Stations, Center Moriches
- Marine Supplies & Equipment Repair, Center Moriches - Boat Supplies & Equipment
- Marriage & Family Counselors, Center Moriches
- Martial Arts & Self Defense Schools, Center Moriches
- Masonry Contractors, Center Moriches - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Center Moriches
- Mausoleum Builders, Center Moriches
- Medical Diagnostic Clinics, Center Moriches - Clinical Labs & Centers
- Membership Sports & Recreation Clubs, Center Moriches
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- Mental Health Specialists, Center Moriches - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Center Moriches
- Mexican Restaurants, Center Moriches
- Ministries Church, Center Moriches
- Miscellaneous Agriculture, Center Moriches
- Miscellaneous Government, Center Moriches
- Miscellaneous Personal Services, Center Moriches
- Miscellaneous Photographers, Center Moriches
- Miscellaneous Professional, Center Moriches
- Monuments, Tombstones, Markers & Memorials, Center Moriches
- Motor Vehicle, Center Moriches
- Motor Vehicle Rental & Leasing, Center Moriches
- Motorcycle & Motor Scooters Dealers, Repair & Service, Center Moriches
- Motorcycle Repair & Service, Center Moriches
- Moving Truck Rental , Center Moriches
- Music, Center Moriches
- Music Entertainment, Center Moriches
- Music Lessons, Center Moriches
- Music Lessons - Instrumental, Center Moriches
- Musical Instruments Repair, Sales & Service, Center Moriches
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