- Mail Delivery Service, Swarthmore
- Management Consultants & Services, Swarthmore
- Manicurists & Pedicurists, Swarthmore
- Manufacturers Agents & Representatives, Swarthmore
- Manufacturers Representative, Swarthmore - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Swarthmore
- Marriage & Family Counselors, Swarthmore
- Martial Arts & Self Defense Schools, Swarthmore
- Massage Therapy, Swarthmore
- Medical Billing Services, Swarthmore
- Medical Diagnostic Clinics, Swarthmore - Clinical Labs & Centers
- Medical Supplies & Equipment, Swarthmore
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- Mediterranean Restaurants, Swarthmore
- Membership Sports & Recreation Clubs, Swarthmore
- Mental Health Specialists, Swarthmore - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Swarthmore
- Miscellaneous Government, Swarthmore
- Miscellaneous Manufacturing, Swarthmore
- Miscellaneous Professional, Swarthmore
- Mortgage Bankers & Correspondents, Swarthmore
- Motor Vehicle, Swarthmore
- Music, Swarthmore
- Musical Instrument Rental, Swarthmore - Band & Orchestra Instruments
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