- Machine Shop & Tool Repair Service, Folcroft
- Machinery, Supplies & Equipment - Business Production Related, Folcroft
- Machinery, Supplies & Equipment - Business Supplies Related, Folcroft
- Machinery, Supplies & Equipment - Construction & Contractor Related, Folcroft
- Mail Delivery Service, Folcroft
- Mailing, Delivery & Courier Service, Folcroft
- Management Consultants & Services, Folcroft
- Manicurists & Pedicurists, Folcroft
- Manufacturers Agents & Representatives, Folcroft
- Manufacturers Representative, Folcroft - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Folcroft
- Manufacturing Products, Folcroft
- Martial Arts & Self Defense Schools, Folcroft
- Masonry Contractors, Folcroft - Stone Mason, Brick Mason - Install & Repair
- Material Handling & Heavy Machinery & Equipment, Folcroft
- Meat Market, Wholesale & Products, Folcroft
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- Mechanical Contractors, Folcroft - Install, Service & Repair
- Medical Supplies & Equipment, Folcroft
- Metal Coating & Allied Services, Folcroft
- Miscellaneous Household Item Repair, Folcroft
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Folcroft
- Miscellaneous Government, Folcroft
- Miscellaneous Industry, Folcroft
- Miscellaneous Manufacturing, Folcroft
- Miscellaneous Personal Services, Folcroft
- Miscellaneous Photographers, Folcroft
- Miscellaneous Professional, Folcroft
- Mongolian Restaurants, Folcroft
- Motor Vehicle, Folcroft
- Motor Vehicle Rental & Leasing, Folcroft
- Moving Supplies & Equipment Rental, Folcroft
- Moving Truck Rental , Folcroft
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