- Machine Shop & Tool Repair Service, Schwenksville
- Machinery, Supplies & Equipment - Business Production Related, Schwenksville
- Machinery, Supplies & Equipment - Business Supplies Related, Schwenksville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Schwenksville
- Magicians & Hypnotist Entertainers, Schwenksville
- Magnetos, Schwenksville
- Management Consultants & Services, Schwenksville
- Manicurists & Pedicurists, Schwenksville
- Manufacturing, Schwenksville
- Masonry Contractors, Schwenksville - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Schwenksville
- Massage Therapy, Schwenksville
- Medical Examiner, Schwenksville - Doctors, Physicians & Surgeons
- Medical Supplies & Equipment, Schwenksville
- Membership Sports & Recreation Clubs, Schwenksville
- Mennonite Church, Schwenksville
- Mental Health Specialists, Schwenksville - Psychologist, Psychiatrist, Psychotherapist, etc
- Mining, Schwenksville
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- Mining Services, Schwenksville
- Ministries Church, Schwenksville
- Miscellaneous Business Product Repair, Schwenksville
- Miscellaneous Agriculture, Schwenksville
- Miscellaneous Government, Schwenksville
- Miscellaneous Manufacturing, Schwenksville
- Miscellaneous Personal Services, Schwenksville
- Mortgage Bankers & Correspondents, Schwenksville
- Motion Picture Pre & Post Production Services, Schwenksville
- Motor Vehicle, Schwenksville
- Motorcycle Parts, Accessories & Dealers, Schwenksville
- Muffler Shop & Exhaust Systems, Schwenksville
- Mulch, Peat & Moss Products, Schwenksville
- Music, Schwenksville
- Music Entertainment, Schwenksville
- Music Schools, Schwenksville
- Musicians, Bands & Disc Jockeys, Schwenksville
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