- Machine Shop & Tool Repair Service, Old Bethpage
- Machinery, Supplies & Equipment - Construction & Contractor Related, Old Bethpage
- Mail Delivery Service, Old Bethpage
- Management Consultants & Services, Old Bethpage
- Manufacturers Agents & Representatives, Old Bethpage
- Manufacturers Representative, Old Bethpage - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Old Bethpage
- Market Research & Analysis , Old Bethpage - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Old Bethpage
- Masonry Contractors, Old Bethpage - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Old Bethpage
- Men's Clothing Stores, Old Bethpage - Clothes & Accessories
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- Mental Health Clinics, Old Bethpage - Treatment Centers
- Mental Retardation & Developmentally Disabled Services, Old Bethpage
- Mini & Self Storage, Old Bethpage
- Miscellaneous Manufacturing, Old Bethpage
- Miscellaneous Professional, Old Bethpage
- Motor Vehicle, Old Bethpage
- Motor Vehicle Rental & Leasing, Old Bethpage
- Moving Companies, Old Bethpage
- Moving Supplies & Equipment Rental, Old Bethpage
- Moving Truck Rental , Old Bethpage
- Museums, Old Bethpage
- Music Entertainment, Old Bethpage
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