- Machine Shop & Tool Repair Service, Baltimore
- Machinery, Supplies & Equipment - Business Supplies Related, Baltimore
- Machinery, Supplies & Equipment - Construction & Contractor Related, Baltimore
- Manufacturing, Baltimore
- Manufacturing Products, Baltimore
- Masonry Materials & Supplies, Baltimore
- Meat Market, Wholesale & Products, Baltimore
- Methodist Church, Baltimore
- Millwork Contractors, Baltimore
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- Miscellaneous Business Credit Institutions & Services, Baltimore
- Miscellaneous Government, Baltimore
- Miscellaneous Photographers, Baltimore
- Miscellaneous Professional, Baltimore
- Monuments, Tombstones, Markers & Memorials, Baltimore
- Mortgage Bankers & Correspondents, Baltimore
- Motor Vehicle, Baltimore
- Museums, Baltimore
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