- Machine Shop & Tool Repair Service, Oreland
- Machinery, Supplies & Equipment - Business Supplies Related, Oreland
- Management Consultants & Services, Oreland
- Manicurists & Pedicurists, Oreland
- Manufacturers Agents & Representatives, Oreland
- Manufacturers Representative, Oreland - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Oreland
- Manufacturing Products, Oreland
- Martial Arts & Self Defense Schools, Oreland
- Masonry Contractors, Oreland - Stone Mason, Brick Mason - Install & Repair
- Medical Billing Services, Oreland
- Medical Transcription Service, Oreland
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- Merchandising & Pricing Equipment, Oreland
- Metal Repair Service & Blacksmith, Oreland - Iron Works
- Miscellaneous Business Services, Oreland
- Miscellaneous Government, Oreland
- Miscellaneous Manufacturing, Oreland
- Miscellaneous Personal Services, Oreland
- Miscellaneous Professional, Oreland
- Mortgage Bankers & Correspondents, Oreland
- Motor Vehicle, Oreland
- Music, Oreland
- Music Schools, Oreland
- Musical Recording Services, Oreland
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