- Machinery, Supplies & Equipment - Business Production Related, Pennsville
- Management Consultants & Services, Pennsville
- Manicurists & Pedicurists, Pennsville
- Manufacturing, Pennsville
- Marine Products And Services, Pennsville
- Marine Repair & Service Stations, Pennsville
- Marine Supplies & Equipment, Pennsville - Boat Supplies
- Marine Supplies & Equipment Repair, Pennsville - Boat Supplies & Equipment
- Martial Arts & Self Defense Schools, Pennsville
- Massage Therapists & Professional, Pennsville
- Massage Therapy, Pennsville
- Mechanical Contractors, Pennsville - Install, Service & Repair
- Medical Diagnostic Clinics, Pennsville - Clinical Labs & Centers
- Membership Sports & Recreation Clubs, Pennsville
- Mental Health Specialists, Pennsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Pennsville - Iron Works
- Methodist Church, Pennsville
- Mexican Restaurants, Pennsville
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- Microwave Ovens, Pennsville
- Miscellaneous Government, Pennsville
- Miscellaneous Personal Services, Pennsville
- Miscellaneous Photographers, Pennsville
- Miscellaneous Professional, Pennsville
- Mobile Home Parks & Communities , Pennsville
- Modular & Mobile Homes For Sale, Pennsville - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Pennsville
- Mortgage Companies, Pennsville
- Motor Vehicle, Pennsville
- Motor Vehicle Rental & Leasing, Pennsville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Pennsville
- Motorcycle Repair & Service, Pennsville
- Moving & Storage Supplies & Equipment, Pennsville
- Moving Supplies & Equipment Rental, Pennsville
- Moving Truck Rental , Pennsville
- Muffler Shop & Exhaust Systems, Pennsville
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