- Machine Shop, Montoursville
- Machine Shop & Tool Repair Service, Montoursville
- Machine Tools , Montoursville
- Machinery, Supplies & Equipment - Business Production Related, Montoursville
- Machinery, Supplies & Equipment - Business Supplies Related, Montoursville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Montoursville
- Mailing, Delivery & Courier Service, Montoursville
- Maintenance, Cleaning & Sanitation, Montoursville
- Major Appliances, Montoursville - Household & Kitchen
- Management Consultants & Services, Montoursville
- Manifold Business Forms Manufacturers, Montoursville
- Manufacturers Agents & Representatives, Montoursville
- Manufacturers Representative, Montoursville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Montoursville
- Manufacturing Products, Montoursville
- Marble Contractors, Montoursville - Installation, Cleaning & Removal Services
- Marriage & Family Counselors, Montoursville
- Martial Arts & Self Defense Schools, Montoursville
- Masonry Materials & Supplies, Montoursville
- Massage Therapists & Professional, Montoursville
- Massage Therapy, Montoursville
- Mats & Matting, Montoursville
- Maytag Appliances, Montoursville
- Medical Supplies & Equipment, Montoursville
- Men's Clothing Stores, Montoursville - Clothes & Accessories
- Mental Health Specialists, Montoursville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Tablets, Montoursville
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- Methodist Church, Montoursville
- Mildew Removal & Control, Montoursville - Mold Removal
- Military Supplies, Montoursville
- Mining, Montoursville
- Mining Contractors, Montoursville - Mining Companies, Contractors & Brokers
- Mining Services, Montoursville
- Mining, Crude-Oil Production, Montoursville - Mining Companies
- Miscellaneous Business Product Repair, Montoursville
- Miscellaneous Government, Montoursville
- Miscellaneous Industry, Montoursville
- Miscellaneous Manufacturing, Montoursville
- Miscellaneous Personal Services, Montoursville
- Miscellaneous Photographers, Montoursville
- Miscellaneous Professional, Montoursville
- Mobile Home Parks & Communities , Montoursville
- Modular & Mobile Homes For Sale, Montoursville - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Montoursville
- Mortgage Bankers & Correspondents, Montoursville
- Mortgage Companies, Montoursville
- Mortgages & Loans, Montoursville
- Motor Vehicle, Montoursville
- Motor Vehicle Rental & Leasing, Montoursville
- Motorcycle Parts, Accessories & Dealers, Montoursville
- Moving Truck Rental , Montoursville
- Muffler Shop & Exhaust Systems, Montoursville
- Museums, Montoursville
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