- Machine Shop & Tool Repair Service, Upper Darby
- Machinery And Equipment Manufacturers, Upper Darby
- Machinery, Supplies & Equipment - Business Production Related, Upper Darby
- Machinery, Supplies & Equipment - Business Supplies Related, Upper Darby
- Machinery, Supplies & Equipment - Construction & Contractor Related, Upper Darby
- Magazine & Newspaper Stands, Upper Darby - Dealers & Distributors
- Mail Delivery Service, Upper Darby
- Maintenance, Cleaning & Sanitation, Upper Darby
- Management Consultants & Services, Upper Darby
- Manicurists & Pedicurists, Upper Darby
- Manufacturing, Upper Darby
- Manufacturing Products, Upper Darby
- Marriage & Family Counselors, Upper Darby
- Martial Arts & Self Defense Schools, Upper Darby
- Masonry Contractors, Upper Darby - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Upper Darby
- Mausoleums Developers, Upper Darby
- Meat Market, Wholesale & Products, Upper Darby
- Medical & Dental Management, Upper Darby
- Medical Billing Services, Upper Darby
- Medical Diagnostic Clinics, Upper Darby - Clinical Labs & Centers
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Upper Darby
- Medical Records Service , Upper Darby
- Medical Research, Upper Darby
- Medical Research & Development, Upper Darby - Medical Information & Research
- Medical Supplies & Equipment, Upper Darby
- Men's Clothing Stores, Upper Darby - Clothes & Accessories
- Mental Health Specialists, Upper Darby - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Upper Darby
- Metal Repair Service & Blacksmith, Upper Darby - Iron Works
- Mexican Restaurants, Upper Darby
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- Middle Eastern Restaurants, Upper Darby
- Mildew Removal & Control, Upper Darby - Mold Removal
- Mini & Self Storage, Upper Darby
- Mirrors, Upper Darby - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Upper Darby
- Miscellaneous Agriculture, Upper Darby
- Miscellaneous Government, Upper Darby
- Miscellaneous Manufacturing, Upper Darby
- Miscellaneous Personal Services, Upper Darby
- Miscellaneous Photographers, Upper Darby
- Miscellaneous Professional, Upper Darby
- Mission Churches, Upper Darby
- Monuments, Tombstones, Markers & Memorials, Upper Darby
- Mortgage Bankers & Correspondents, Upper Darby
- Mortgage Companies, Upper Darby
- Mortgages & Loans, Upper Darby
- Motion Picture & Television Production Services, Upper Darby
- Motion Picture Pre & Post Production Services, Upper Darby
- Motor Vehicle, Upper Darby
- Motor Vehicle Rental & Leasing, Upper Darby
- Motorcycle & Motor Scooters Dealers, Repair & Service, Upper Darby
- Motorcycle Repair & Service, Upper Darby
- Movie Theaters, Upper Darby
- Moving Companies, Upper Darby
- Moving Supplies & Equipment Rental, Upper Darby
- Moving Truck Rental , Upper Darby
- Muffler Shop & Exhaust Systems, Upper Darby
- Multimedia Publishers, Upper Darby - Multimedia Services & Systems
- Music, Upper Darby
- Musical Recording Services, Upper Darby
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