- Machinery, Supplies & Equipment - Business Production Related, Duncannon
- Machinery, Supplies & Equipment - Business Supplies Related, Duncannon
- Machinery, Supplies & Equipment - Construction & Contractor Related, Duncannon
- Management Consultants & Services, Duncannon
- Manicurists & Pedicurists, Duncannon
- Manufacturers Agents & Representatives, Duncannon
- Manufacturers Representative, Duncannon - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Duncannon
- Marine Supplies & Equipment, Duncannon - Boat Supplies
- Masonry Contractors, Duncannon - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Duncannon
- Mass Transit Vehicle Dealers, Duncannon
- Massage Therapy, Duncannon
- Meat Market, Wholesale & Products, Duncannon
- Medical Groups & Clinics, Duncannon - Medical & Health Centers
- Medical Supplies & Equipment, Duncannon
- Membership Sports & Recreation Clubs, Duncannon
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- Merchandise Sales Events, Duncannon
- Methodist Church, Duncannon
- Miscellaneous Business Services, Duncannon
- Miscellaneous Government, Duncannon
- Miscellaneous Manufacturing, Duncannon
- Miscellaneous Personal Services, Duncannon
- Miscellaneous Professional, Duncannon
- Monuments, Tombstones, Markers & Memorials, Duncannon
- Mortgage Bankers & Correspondents, Duncannon
- Mortgage Companies, Duncannon
- Motor Vehicle, Duncannon
- Motor Vehicle Rental & Leasing, Duncannon
- Motorcycle & Motor Scooters Dealers, Repair & Service, Duncannon
- Motorcycle Parts, Accessories & Dealers, Duncannon
- Motorcycle Repair & Service, Duncannon
- Moving Truck Rental , Duncannon
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