- Machine Shop & Tool Repair Service, Dundalk
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dundalk
- Magicians & Hypnotist Entertainers, Dundalk
- Management Consultants & Services, Dundalk
- Manufacturing, Dundalk
- Manufacturing Products, Dundalk
- Masonry Materials & Supplies, Dundalk
- Massage Therapists & Professional, Dundalk
- Massage Therapy, Dundalk
- Metal Working Machinery, Dundalk
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- Mini & Self Storage, Dundalk
- Miscellaneous Business Product Repair, Dundalk
- Miscellaneous Government, Dundalk
- Mortgage Bankers & Correspondents, Dundalk
- Mortgage Brokers, Dundalk
- Motion Picture & Television Production Services, Dundalk
- Motion Picture Dists & Producers, Dundalk
- Motor Vehicle, Dundalk
- Motor Vehicle Rental & Leasing, Dundalk
- Moving Truck Rental , Dundalk
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