- Machinery, Supplies & Equipment - Construction & Contractor Related, Wernersville
- Mail Delivery Service, Wernersville
- Major Appliances, Wernersville - Household & Kitchen
- Management Consultants & Services, Wernersville
- Manicurists & Pedicurists, Wernersville
- Manufacturers Agents & Representatives, Wernersville
- Manufacturers Representative, Wernersville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Wernersville
- Mastectomy Apparel, Forms, Prostheses & Supplies, Wernersville
- Medical Alert Systems, Wernersville - Medical Alarms - PERS
- Medical Supplies & Equipment, Wernersville
- Mennonite Church, Wernersville
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- Millwork Contractors, Wernersville
- Miscellaneous Government, Wernersville
- Miscellaneous Manufacturing, Wernersville
- Miscellaneous Personal Services, Wernersville
- Miscellaneous Photographers, Wernersville
- Miscellaneous Professional, Wernersville
- Moldings Materials, Wernersville
- Molds, Wernersville
- Motion Picture Pre & Post Production Services, Wernersville
- Motor Vehicle, Wernersville
- Museums, Wernersville
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