- Machine Shop & Tool Repair Service, Londonderry
- Machinery And Equipment Manufacturers, Londonderry
- Machinery, Supplies & Equipment - Business Production Related, Londonderry
- Machinery, Supplies & Equipment - Business Supplies Related, Londonderry
- Machinery, Supplies & Equipment - Construction & Contractor Related, Londonderry
- Mailing, Delivery & Courier Service, Londonderry
- Maintenance, Cleaning & Sanitation, Londonderry
- Major Appliances, Londonderry - Household & Kitchen
- Management Consultants & Services, Londonderry
- Manicurists & Pedicurists, Londonderry
- Manufacturers Agents & Representatives, Londonderry
- Manufacturers Representative, Londonderry - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Londonderry
- Manufacturing Products, Londonderry
- Marine Products And Services, Londonderry
- Marine Services, Londonderry
- Market Research & Analysis , Londonderry - Market Analysis, Business & Economic Research
- Marketing Schools, Londonderry
- Marking, Stamping & Engraving Equipment, Londonderry
- Marriage & Family Counselors, Londonderry
- Martial Arts & Self Defense Schools, Londonderry
- Masonry Materials & Supplies, Londonderry
- Massage Therapists & Professional, Londonderry
- Massage Therapy, Londonderry
- Material Handling & Heavy Machinery & Equipment, Londonderry
- Material Handling Equipment, Londonderry - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Londonderry
- Mechanical Engineer, Londonderry - Mechanical Engineering Service
- Medical & Health Service Organizations, Londonderry
- Medical Alert Systems, Londonderry - Medical Alarms - PERS
- Medical Diagnostic Imaging, Londonderry
- Medical Records Service , Londonderry
- Medical Supplies & Equipment, Londonderry
- Membership Sports & Recreation Clubs, Londonderry
- Mental Health Specialists, Londonderry - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Londonderry
- Metal Distributors, Londonderry
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- Metal Finishers, Londonderry
- Metal Plating & Polishing, Londonderry
- Methodist Church, Londonderry
- Mexican Restaurants, Londonderry
- Microfilm & Imaging Service, Equipment & Supplies , Londonderry
- Millwork Contractors, Londonderry
- Mini & Self Storage, Londonderry
- Mining, Londonderry
- Mirrors, Londonderry - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Londonderry
- Miscellaneous Business Services, Londonderry
- Miscellaneous Government, Londonderry
- Miscellaneous Manufacturing, Londonderry
- Miscellaneous Personal Services, Londonderry
- Miscellaneous Professional, Londonderry
- Molds, Londonderry
- Monuments, Tombstones, Markers & Memorials, Londonderry
- Mortgage Bankers & Correspondents, Londonderry
- Motion Picture & Television Production Services, Londonderry
- Motion Picture Dists & Producers, Londonderry
- Motion Picture Pre & Post Production Services, Londonderry
- Motion Pictures Video Tape Duplication & Transfer Services, Londonderry
- Motor Vehicle, Londonderry
- Motor Vehicle Rental & Leasing, Londonderry
- Motorcycle & Motor Scooters Dealers, Repair & Service, Londonderry
- Motorcycle Parts, Accessories & Dealers, Londonderry
- Motorcycle Repair & Service, Londonderry
- Movie Memorabilia, Londonderry
- Movie Theaters, Londonderry
- Moving Companies, Londonderry
- Moving Truck Rental , Londonderry
- Muffler Shop & Exhaust Systems, Londonderry
- Music, Londonderry
- Music Lessons, Londonderry
- Music Lessons - Instrumental, Londonderry
- Music Publishers & Distribution, Londonderry
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