- Machine Shop & Tool Repair Service, Phoenixville
- Machinery, Supplies & Equipment - Business Production Related, Phoenixville
- Machinery, Supplies & Equipment - Business Supplies Related, Phoenixville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Phoenixville
- Magazine Ads, Phoenixville - Periodical Advertising
- Mailbox Rental Services, Phoenixville
- Mailing, Delivery & Courier Service, Phoenixville
- Maintenance, Cleaning & Sanitation, Phoenixville
- Major Appliances, Phoenixville - Household & Kitchen
- Malls & Shopping Centers, Phoenixville
- Management Consultants & Services, Phoenixville
- Manicurists & Pedicurists, Phoenixville
- Manufacturers Agents & Representatives, Phoenixville
- Manufacturers Representative, Phoenixville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Phoenixville
- Manufacturing Equipment & Supplies, Phoenixville
- Manufacturing Products, Phoenixville
- Market Research & Analysis , Phoenixville - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Phoenixville
- Martial Arts & Self Defense Schools, Phoenixville
- Masonry Contractors, Phoenixville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Phoenixville
- Massage Therapists & Professional, Phoenixville
- Massage Therapy, Phoenixville
- Mausoleums Developers, Phoenixville
- Meat Market, Wholesale & Products, Phoenixville
- Medical & Health Service Organizations, Phoenixville
- Medical Diagnostic Clinics, Phoenixville - Clinical Labs & Centers
- Medical Diagnostic Imaging, Phoenixville
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Phoenixville
- Medical Supplies & Equipment, Phoenixville
- Membership Sports & Recreation Clubs, Phoenixville
- Mental Health Specialists, Phoenixville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Phoenixville
- Metal Specialties, Phoenixville
- Methodist Church, Phoenixville
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- Mexican Restaurants, Phoenixville
- Middle Eastern Restaurants, Phoenixville
- Mildew Removal & Control, Phoenixville - Mold Removal
- Minerals, Phoenixville
- Mini & Self Storage, Phoenixville
- Miscellaneous Business Product Repair, Phoenixville
- Miscellaneous Agriculture, Phoenixville
- Miscellaneous Business Services, Phoenixville
- Miscellaneous Government, Phoenixville
- Miscellaneous Manufacturing, Phoenixville
- Miscellaneous Personal Services, Phoenixville
- Miscellaneous Photographers, Phoenixville
- Miscellaneous Professional, Phoenixville
- Mission Churches, Phoenixville
- Mobile Home Parks & Communities , Phoenixville
- Monuments, Tombstones, Markers & Memorials, Phoenixville
- Mortgage Bankers & Correspondents, Phoenixville
- Mortgages & Loans, Phoenixville
- Motion Picture Pre & Post Production Services, Phoenixville
- Motor Vehicle, Phoenixville
- Motor Vehicle Rental & Leasing, Phoenixville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Phoenixville
- Motorcycle Repair & Service, Phoenixville
- Movie Theaters, Phoenixville
- Moving & Storage Supplies & Equipment, Phoenixville
- Moving Companies, Phoenixville
- Moving Supplies & Equipment Rental, Phoenixville
- Moving Truck Rental , Phoenixville
- Muffler Shop & Exhaust Systems, Phoenixville
- Mulch, Peat & Moss Products, Phoenixville
- Music, Phoenixville
- Music Sheet, Phoenixville
- Music Stores Retail, Phoenixville
- Musical Instrument Rental, Phoenixville - Band & Orchestra Instruments
- Musical Instruments Repair, Sales & Service, Phoenixville
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