- Machine Shop & Tool Repair Service, Dundalk
- Machinery, Supplies & Equipment - Business Production Related, Dundalk
- Machinery, Supplies & Equipment - Business Supplies Related, Dundalk
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dundalk
- Mailing, Delivery & Courier Service, Dundalk
- Maintenance, Cleaning & Sanitation, Dundalk
- Major Appliances, Dundalk - Household & Kitchen
- Malls & Shopping Centers, Dundalk
- Management Consultants & Services, Dundalk
- Manicurists & Pedicurists, Dundalk
- Manufacturing, Dundalk
- Manufacturing Equipment & Supplies, Dundalk
- Manufacturing Products, Dundalk
- Marble, Dundalk
- Marinas & Marina Services, Dundalk
- Marine Contractors & Designers, Dundalk
- Marine Products And Services, Dundalk
- Marine Repair & Service Stations, Dundalk
- Marine Services, Dundalk
- Marine Supplies & Equipment, Dundalk - Boat Supplies
- Marine Supplies & Equipment Repair, Dundalk - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Dundalk
- Marriage & Family Counselors, Dundalk
- Martial Arts & Self Defense Schools, Dundalk
- Masonry Contractors, Dundalk - Stone Mason, Brick Mason - Install & Repair
- Masonry Contractors Commercial & Industrial, Dundalk
- Masonry Materials & Supplies, Dundalk
- Material Handling & Heavy Machinery & Equipment, Dundalk
- Material Handling Equipment, Dundalk - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Dundalk
- Mechanical Contractors, Dundalk - Install, Service & Repair
- Mechanical Engineer, Dundalk - Mechanical Engineering Service
- Medical & Dental Management, Dundalk
- Medical Management & Business Administration Service, Dundalk
- Medical Supplies & Equipment, Dundalk
- Membership Sports & Recreation Clubs, Dundalk
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- Mental & Developmental Information & Referral Services, Dundalk
- Mental Health Specialists, Dundalk - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Dundalk
- Metal Coating & Allied Services, Dundalk
- Metal Plating & Polishing, Dundalk
- Metal Specialties, Dundalk
- Methodist Church, Dundalk
- Mexican Restaurants, Dundalk
- Mini & Self Storage, Dundalk
- Ministries Church, Dundalk
- Miscellaneous Household Item Repair, Dundalk
- Miscellaneous Government, Dundalk
- Miscellaneous Industry, Dundalk
- Miscellaneous Manufacturing, Dundalk
- Miscellaneous Personal Services, Dundalk
- Miscellaneous Professional, Dundalk
- Modular & Mobile Homes For Sale, Dundalk - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Dundalk
- Mortgage Bankers & Correspondents, Dundalk
- Mortgages & Loans, Dundalk
- Mortgages Commercial & Industrial, Dundalk
- Motion Picture & Television Production Services, Dundalk
- Motor Vehicle, Dundalk
- Motor Vehicle Rental & Leasing, Dundalk
- Motorcycle & Motor Scooters Dealers, Repair & Service, Dundalk
- Motorcycle Parts, Accessories & Dealers, Dundalk
- Motorcycle Repair & Service, Dundalk
- Moving & Storage Supplies & Equipment, Dundalk
- Moving Companies, Dundalk
- Moving Supplies & Equipment Rental, Dundalk
- Moving Truck Rental , Dundalk
- Muffler Shop & Exhaust Systems, Dundalk
- Museums, Dundalk
- Music, Dundalk
- Musical Instrument Rental, Dundalk - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Dundalk
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