- Machine Shop & Tool Repair Service, Clairton
- Machinery, Supplies & Equipment - Business Production Related, Clairton
- Magazine & Newspaper Stands, Clairton - Dealers & Distributors
- Major Appliance Renting & Leasing, Clairton
- Major Appliances, Clairton - Household & Kitchen
- Management Consultants & Services, Clairton
- Manufacturing, Clairton
- Manufacturing & Industrial Consultants, Clairton
- Manufacturing Products, Clairton
- Martial Arts & Self Defense Schools, Clairton
- Mechanical Contractors, Clairton - Install, Service & Repair
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- Medical Diagnostic Clinics, Clairton - Clinical Labs & Centers
- Medical Supplies & Equipment, Clairton
- Membership Sports & Recreation Clubs, Clairton
- Metal Products, Clairton
- Methodist Church, Clairton
- Miscellaneous Government, Clairton
- Miscellaneous Manufacturing, Clairton
- Miscellaneous Professional, Clairton
- Mortgage Bankers & Correspondents, Clairton
- Motion Picture Pre & Post Production Services, Clairton
- Motor Vehicle, Clairton
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