- Mailbox Rental Services, Portola Valley
- Mailing, Delivery & Courier Service, Portola Valley
- Management Consultants & Services, Portola Valley
- Manicurists & Pedicurists, Portola Valley
- Medical Research, Portola Valley
- Medical Research & Development, Portola Valley - Medical Information & Research
- Membership Sports & Recreation Clubs, Portola Valley
- Mental Health Specialists, Portola Valley - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Portola Valley
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