- Machine Shop & Tool Repair Service, Los Alamos
- Machinery, Supplies & Equipment - Business Supplies Related, Los Alamos
- Malls & Shopping Centers, Los Alamos
- Management Consultants & Services, Los Alamos
- Manicurists & Pedicurists, Los Alamos
- Manufacturing, Los Alamos
- Marriage & Family Counselors, Los Alamos
- Martial Arts & Self Defense Schools, Los Alamos
- Masonry Materials & Supplies, Los Alamos
- Massage Therapists & Professional, Los Alamos
- Massage Therapy, Los Alamos
- Medical Research, Los Alamos
- Medical Research & Development, Los Alamos - Medical Information & Research
- Medical Supplies & Equipment, Los Alamos
- Membership Sports & Recreation Clubs, Los Alamos
- Men's Clothing Stores, Los Alamos - Clothes & Accessories
- Mental Health Specialists, Los Alamos - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Los Alamos
- Metal Repair Service & Blacksmith, Los Alamos - Iron Works
- Methodist Church, Los Alamos
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- Mexican Restaurants, Los Alamos
- Mini & Self Storage, Los Alamos
- Mining, Los Alamos
- Miscellaneous Business Product Repair, Los Alamos
- Miscellaneous Business Services, Los Alamos
- Miscellaneous Government, Los Alamos
- Miscellaneous Personal Services, Los Alamos
- Miscellaneous Professional, Los Alamos
- Monuments, Tombstones, Markers & Memorials, Los Alamos
- Mortgage Bankers & Correspondents, Los Alamos
- Motor Vehicle, Los Alamos
- Motor Vehicle Rental & Leasing, Los Alamos
- Motorcycle Parts, Accessories & Dealers, Los Alamos
- Movie Theaters, Los Alamos
- Moving Truck Rental , Los Alamos
- Muffler Shop & Exhaust Systems, Los Alamos
- Museums, Los Alamos
- Music Entertainment, Los Alamos
- Musicians, Bands & Disc Jockeys, Los Alamos
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