- Machinery, Supplies & Equipment - Construction & Contractor Related, Berwick
- Maintenance, Cleaning & Sanitation, Berwick
- Management Consultants & Services, Berwick
- Manufacturing, Berwick
- Manufacturing Products, Berwick
- Medical & Health Service Organizations, Berwick
- Methodist Church, Berwick
- Mildew Removal & Control, Berwick - Mold Removal
- Miscellaneous Personal Services, Berwick
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- Miscellaneous Professional, Berwick
- Modular & Mobile Homes For Sale, Berwick - Manufactured Homes Sale & Service
- Motor Vehicle, Berwick
- Motor Vehicle Rental & Leasing, Berwick
- Motorcycle & Motor Scooters Dealers, Repair & Service, Berwick
- Motorcycle Repair & Service, Berwick
- Moving Truck Rental , Berwick
- Mulch, Peat & Moss Products, Berwick
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