- Machine Shop & Tool Repair Service, Mercersburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Mercersburg
- Mail Delivery Service, Mercersburg
- Management Consultants & Services, Mercersburg
- Manufactured & Mobile Home Movers & Transporting, Mercersburg
- Manufacturing, Mercersburg
- Manufacturing & Industrial Consultants, Mercersburg
- Manufacturing Products, Mercersburg
- Manufacturing Services, Mercersburg
- Massage Therapy, Mercersburg
- Mechanical Contractors, Mercersburg - Install, Service & Repair
- Mechanical Engineer, Mercersburg - Mechanical Engineering Service
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- Mennonite Church, Mercersburg
- Merchandise Sales Events, Mercersburg
- Methodist Church, Mercersburg
- Miscellaneous Government, Mercersburg
- Miscellaneous Manufacturing, Mercersburg
- Miscellaneous Personal Services, Mercersburg
- Miscellaneous Professional, Mercersburg
- Mortgages & Loans, Mercersburg
- Motion Picture Pre & Post Production Services, Mercersburg
- Motor Vehicle, Mercersburg
- Muffler Shop & Exhaust Systems, Mercersburg
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