- Machinery, Supplies & Equipment - Business Supplies Related, Mertztown
- Magazine & Newspaper Stands, Mertztown - Dealers & Distributors
- Mail Delivery Service, Mertztown
- Major Appliances, Mertztown - Household & Kitchen
- Manufacturing, Mertztown
- Masonry Contractors, Mertztown - Stone Mason, Brick Mason - Install & Repair
- Masonry Panels Prefabricated, Mertztown
- Mechanical Contractors, Mertztown - Install, Service & Repair
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- Mental Health Specialists, Mertztown - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Mertztown
- Miscellaneous Government, Mertztown
- Miscellaneous Industry, Mertztown
- Miscellaneous Personal Services, Mertztown
- Motor Vehicle, Mertztown
- Moving Companies, Mertztown
- Mulch, Peat & Moss Products, Mertztown
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