- Machine Shop & Tool Repair Service, Collegeville
- Machinery And Equipment Manufacturers, Collegeville
- Machinery, Supplies & Equipment - Business Production Related, Collegeville
- Machinery, Supplies & Equipment - Business Supplies Related, Collegeville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Collegeville
- Magazine & Newspaper Stands, Collegeville - Dealers & Distributors
- Major Appliance Repair & Service, Collegeville
- Major Appliances, Collegeville - Household & Kitchen
- Management Consultants & Services, Collegeville
- Manicurists & Pedicurists, Collegeville
- Manufacturing, Collegeville
- Manufacturing Products, Collegeville
- Market Research & Analysis , Collegeville - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Collegeville
- Martial Arts & Self Defense Schools, Collegeville
- Masonry Contractors, Collegeville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Collegeville
- Massage Therapists & Professional, Collegeville
- Massage Therapy, Collegeville
- Medical & Infectious Waste Disposal, Collegeville
- Medical Diagnostic Clinics, Collegeville - Clinical Labs & Centers
- Medical Research, Collegeville
- Medical Research & Development, Collegeville - Medical Information & Research
- Medical Supplies & Equipment, Collegeville
- Men's Clothing Stores, Collegeville - Clothes & Accessories
- Mennonite Church, Collegeville
- Mental Health Specialists, Collegeville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Finishers, Collegeville
- Metal Plating & Polishing, Collegeville
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- Metaphysical Churches, Collegeville
- Methodist Church, Collegeville
- Mexican Restaurants, Collegeville
- Middle Eastern Restaurants, Collegeville
- Mini & Self Storage, Collegeville
- Miscellaneous Business Product Repair, Collegeville
- Miscellaneous Household Item Repair, Collegeville
- Miscellaneous Government, Collegeville
- Miscellaneous Manufacturing, Collegeville
- Miscellaneous Personal Services, Collegeville
- Miscellaneous Photographers, Collegeville
- Miscellaneous Professional, Collegeville
- Mortgage Bankers & Correspondents, Collegeville
- Mortgages & Loans, Collegeville
- Motion Picture & Television Production Services, Collegeville
- Motor Vehicle, Collegeville
- Motor Vehicle Rental & Leasing, Collegeville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Collegeville
- Motorcycle Parts, Accessories & Dealers, Collegeville
- Motorcycle Repair & Service, Collegeville
- Movie Theaters, Collegeville
- Moving Companies, Collegeville
- Moving Supplies & Equipment Rental, Collegeville
- Moving Truck Rental , Collegeville
- Muffler Shop & Exhaust Systems, Collegeville
- Music, Collegeville
- Music Schools, Collegeville
- Musical Recording Services, Collegeville
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