- Machinery Repair & Rebuild, Altadena
- Machinery, Supplies & Equipment - Business Supplies Related, Altadena
- Magazine & Newspaper Stands, Altadena - Dealers & Distributors
- Management Consultants & Services, Altadena
- Manicurists & Pedicurists, Altadena
- Manufacturing, Altadena
- Manufacturing Products, Altadena
- Market Research & Analysis , Altadena - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Altadena
- Martial Arts & Self Defense Schools, Altadena
- Masonry Contractors, Altadena - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, Altadena
- Meat Market, Wholesale & Products, Altadena
- Medical & Dental Management, Altadena
- Medical & Health Service Organizations, Altadena
- Medical Business Management Services, Altadena
- Medical Management & Business Administration Service, Altadena
- Memorial Libraries, Altadena
- Mental Health Clinics, Altadena - Treatment Centers
- Mental Health Specialists, Altadena - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Altadena
- Merchandising & Marketing Consultants, Altadena
- Methodist Church, Altadena
- Metropolitan Church, Altadena
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- Mexican Restaurants, Altadena
- Miscellaneous Household Item Repair, Altadena
- Miscellaneous Business Services, Altadena
- Miscellaneous Government, Altadena
- Miscellaneous Industry, Altadena
- Miscellaneous Manufacturing, Altadena
- Miscellaneous Personal Services, Altadena
- Miscellaneous Photographers, Altadena
- Miscellaneous Professional, Altadena
- Mission Churches, Altadena
- Motion Picture & Television Production Services, Altadena
- Motion Picture Equipment & Supplies, Altadena
- Motion Picture Film, Altadena
- Motion Picture Pre & Post Production Services, Altadena
- Motion Picture Special Effects, Altadena
- Motor Vehicle, Altadena
- Motor Vehicle Rental & Leasing, Altadena
- Moving Companies, Altadena
- Moving Truck Rental , Altadena
- Multimedia Publishers, Altadena - Multimedia Services & Systems
- Music, Altadena
- Musical Instrument Rental, Altadena - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Altadena
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