- Machinery, Supplies & Equipment - Business Production Related, Uniondale
- Machinery, Supplies & Equipment - Business Supplies Related, Uniondale
- Machinery, Supplies & Equipment - Construction & Contractor Related, Uniondale
- Mail Delivery Service, Uniondale
- Mailing, Delivery & Courier Service, Uniondale
- Major Appliances, Uniondale - Household & Kitchen
- Management Consultants & Services, Uniondale
- Manicurists & Pedicurists, Uniondale
- Manufacturers Agents & Representatives, Uniondale
- Manufacturers Representative, Uniondale - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Uniondale
- Manufacturing & Industrial Consultants, Uniondale
- Marketing Consultants Professional Practices, Uniondale
- Martial Arts & Self Defense Schools, Uniondale
- Meat Market, Wholesale & Products, Uniondale
- Medical & Dental Management, Uniondale
- Medical & Health Service Organizations, Uniondale
- Medical Diagnostic Clinics, Uniondale - Clinical Labs & Centers
- Medical Management & Business Administration Service, Uniondale
- Medical Transcription Service, Uniondale
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- Membership Sports & Recreation Clubs, Uniondale
- Methodist Church, Uniondale
- Mexican Restaurants, Uniondale
- Miscellaneous Household Item Repair, Uniondale
- Miscellaneous Business Services, Uniondale
- Miscellaneous Government, Uniondale
- Miscellaneous Manufacturing, Uniondale
- Miscellaneous Personal Services, Uniondale
- Miscellaneous Professional, Uniondale
- Money Transfer Service, Uniondale
- Monuments, Tombstones, Markers & Memorials, Uniondale
- Mortgage Bankers & Correspondents, Uniondale
- Motion Picture Pre & Post Production Services, Uniondale
- Motor Vehicle, Uniondale
- Motorcycle Parts, Accessories & Dealers, Uniondale
- Music, Uniondale
- Music Entertainment, Uniondale
- Music Lessons, Uniondale
- Music Lessons - Instrumental, Uniondale
- Musical Instruments & Equipment Stores, Uniondale
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