- Machine Shop, Philadelphia
- Machine Shop & Tool Repair Service, Philadelphia
- Machinery, Supplies & Equipment - Business Production Related, Philadelphia
- Machinery, Supplies & Equipment - Business Supplies Related, Philadelphia
- Machinery, Supplies & Equipment - Construction & Contractor Related, Philadelphia
- Major Appliances, Philadelphia - Household & Kitchen
- Management Consultants & Services, Philadelphia
- Manicurists & Pedicurists, Philadelphia
- Manufacturing, Philadelphia
- Manufacturing Products, Philadelphia
- Masonry Materials & Supplies, Philadelphia
- Medical Groups & Clinics, Philadelphia - Medical & Health Centers
- Medical Research, Philadelphia
- Medical Research & Development, Philadelphia - Medical Information & Research
- Medical Supplies & Equipment, Philadelphia
- Membership Sports & Recreation Clubs, Philadelphia
- Men's & Boys Clothing & Accessories Stores, Philadelphia
- Men's Clothing Stores, Philadelphia - Clothes & Accessories
- Mens & Boys Belts & Suspenders, Philadelphia
- Mens & Boys Suits & Trousers, Philadelphia
- Mental Health Clinics, Philadelphia - Treatment Centers
- Mental Health Specialists, Philadelphia - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Buildings, Philadelphia - Kits, Homes, Steel Buildings, etc
- Methodist Church, Philadelphia
- Mexican Restaurants, Philadelphia
- Mining, Philadelphia
- Miscellaneous Agriculture, Philadelphia
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Philadelphia
- Miscellaneous Government, Philadelphia
- Miscellaneous Manufacturing, Philadelphia
- Miscellaneous Personal Services, Philadelphia
- Miscellaneous Professional, Philadelphia
- Modular & Mobile Homes For Sale, Philadelphia - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Philadelphia
- Mortgage Bankers & Correspondents, Philadelphia
- Motor Vehicle, Philadelphia
- Motor Vehicle Rental & Leasing, Philadelphia
- Movie Theaters, Philadelphia
- Moving Companies, Philadelphia
- Moving Supplies & Equipment Rental, Philadelphia
- Moving Truck Rental , Philadelphia
- Music, Philadelphia
- Musical Instruments & Equipment Stores, Philadelphia
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