- Machinery, Supplies & Equipment - Construction & Contractor Related, Duncansville
- Mail Delivery Service, Duncansville
- Mailing List Service, Brokers & Compilers, Duncansville
- Mailing, Delivery & Courier Service, Duncansville
- Management Consultants & Services, Duncansville
- Manufactured & Mobile Home Movers & Transporting, Duncansville
- Manufacturing, Duncansville
- Manufacturing Products, Duncansville
- Masonry Contractors, Duncansville - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Duncansville
- Massage Therapy, Duncansville
- Meat Market, Wholesale & Products, Duncansville
- Medical & Infectious Waste Disposal, Duncansville
- Medical Supplies & Equipment, Duncansville
- Mental Health Specialists, Duncansville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Duncansville
- Metal Buildings, Duncansville - Kits, Homes, Steel Buildings, etc
- Metal Stampings Manufacturers, Duncansville
- Methodist Church, Duncansville
- Mini & Self Storage, Duncansville
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- Miscellaneous Household Item Repair, Duncansville
- Miscellaneous Business Services, Duncansville
- Miscellaneous Government, Duncansville
- Miscellaneous Metal Work Manufacturers, Duncansville
- Miscellaneous Personal Services, Duncansville
- Miscellaneous Professional, Duncansville
- Mission Churches, Duncansville
- Mobile Home Parks & Communities , Duncansville
- Modular & Mobile Homes For Sale, Duncansville - Manufactured Homes Sale & Service
- Mopeds & Motor Scooters Rental, Duncansville
- Mortgage Bankers & Correspondents, Duncansville
- Mortgage Companies, Duncansville
- Mortgages & Loans, Duncansville
- Motor Vehicle, Duncansville
- Motor Vehicle Rental & Leasing, Duncansville
- Motorcycle Parts, Accessories & Dealers, Duncansville
- Moving Companies, Duncansville
- Moving Truck Rental , Duncansville
- Museums, Duncansville
- Music, Duncansville
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