- Machine Shop, San Andreas
- Machine Shop & Tool Repair Service, San Andreas
- Machinery, Supplies & Equipment - Business Production Related, San Andreas
- Machinery, Supplies & Equipment - Business Supplies Related, San Andreas
- Management Consultants & Services, San Andreas
- Manufacturing, San Andreas
- Marine Products And Services, San Andreas
- Marine Repair & Service Stations, San Andreas
- Marine Supplies & Equipment Repair, San Andreas - Boat Supplies & Equipment
- Masonry Materials & Supplies, San Andreas
- Medical Alert Systems, San Andreas - Medical Alarms - PERS
- Medical Diagnostic Clinics, San Andreas - Clinical Labs & Centers
- Medical Supplies & Equipment, San Andreas
- Men's & Boys Clothing & Accessories Stores, San Andreas
- Mens & Boys Jeans & Western Wear Stores, San Andreas
- Mental Health Specialists, San Andreas - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, San Andreas
- Mexican Restaurants, San Andreas
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- Mini & Self Storage, San Andreas
- Mining, San Andreas
- Miscellaneous Business Product Repair, San Andreas
- Miscellaneous Business Services, San Andreas
- Miscellaneous Government, San Andreas
- Miscellaneous Industry, San Andreas
- Mobile Home Parks & Communities , San Andreas
- Monuments, Tombstones, Markers & Memorials, San Andreas
- Mortgage Bankers & Correspondents, San Andreas
- Mortgages & Loans, San Andreas
- Motion Picture & Television Production Services, San Andreas
- Motor Vehicle, San Andreas
- Muffler Shop & Exhaust Systems, San Andreas
- Museums, San Andreas
- Music, San Andreas
- Music Lessons, San Andreas
- Music Lessons - Instrumental, San Andreas
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