- Machinery, Supplies & Equipment - Business Supplies Related, Farmingville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Farmingville
- Mailing, Delivery & Courier Service, Farmingville
- Maintenance, Cleaning & Sanitation, Farmingville
- Management Consultants & Services, Farmingville
- Manicurists & Pedicurists, Farmingville
- Manufacturing, Farmingville
- Marriage & Family Counselors, Farmingville
- Martial Arts & Self Defense Schools, Farmingville
- Masonry Contractors, Farmingville - Stone Mason, Brick Mason - Install & Repair
- Medical Groups & Clinics, Farmingville - Medical & Health Centers
- Medical Supplies & Equipment, Farmingville
- Membership Sports & Recreation Clubs, Farmingville
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- Mental Health Specialists, Farmingville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Farmingville
- Metal Buildings, Farmingville - Kits, Homes, Steel Buildings, etc
- Mexican Restaurants, Farmingville
- Mini & Self Storage, Farmingville
- Miscellaneous Government, Farmingville
- Miscellaneous Personal Services, Farmingville
- Miscellaneous Professional, Farmingville
- Mortgage Bankers & Correspondents, Farmingville
- Motor Vehicle, Farmingville
- Music Entertainment, Farmingville
- Musicians, Bands & Disc Jockeys, Farmingville
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