- Machine Shop & Tool Repair Service, Lake Hopatcong
- Machinery, Supplies & Equipment - Business Supplies Related, Lake Hopatcong
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lake Hopatcong
- Mailing, Delivery & Courier Service, Lake Hopatcong
- Management Consultants & Services, Lake Hopatcong
- Manicurists & Pedicurists, Lake Hopatcong
- Manufacturing, Lake Hopatcong
- Marinas & Marina Services, Lake Hopatcong
- Marine Contractors & Designers, Lake Hopatcong
- Marine Electronic Equipment, Lake Hopatcong
- Marine Equipment Supplies & Service, Lake Hopatcong
- Marine Supplies & Equipment, Lake Hopatcong - Boat Supplies
- Masonry Contractors, Lake Hopatcong - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, Lake Hopatcong
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- Medical & Health Service Organizations, Lake Hopatcong
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Lake Hopatcong
- Medical Research, Lake Hopatcong
- Medical Research & Development, Lake Hopatcong - Medical Information & Research
- Medical Supplies & Equipment, Lake Hopatcong
- Membership Sports & Recreation Clubs, Lake Hopatcong
- Methodist Church, Lake Hopatcong
- Mini & Self Storage, Lake Hopatcong
- Miscellaneous Government, Lake Hopatcong
- Miscellaneous Personal Services, Lake Hopatcong
- Miscellaneous Professional, Lake Hopatcong
- Motor Vehicle, Lake Hopatcong
- Motor Vehicle Rental & Leasing, Lake Hopatcong
- Moving Truck Rental , Lake Hopatcong
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