- Machine Shop & Tool Repair Service, Lunenburg
- Machinery, Supplies & Equipment - Business Production Related, Lunenburg
- Machinery, Supplies & Equipment - Business Supplies Related, Lunenburg
- Manufacturing, Lunenburg
- Marine & Boat Products, Lunenburg
- Marine Electronic Equipment, Lunenburg
- Marine Supplies & Equipment, Lunenburg - Boat Supplies
- Marine Surveyors & Adjustors, Lunenburg
- Masonry Materials & Supplies, Lunenburg
- Massage Therapists & Professional, Lunenburg
- Massage Therapy, Lunenburg
- Medical Supplies & Equipment, Lunenburg
- Membership Sports & Recreation Clubs, Lunenburg
- Mental Health Specialists, Lunenburg - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Buildings, Lunenburg - Kits, Homes, Steel Buildings, etc
- Mini & Self Storage, Lunenburg
- Miscellaneous Agriculture, Lunenburg
- Miscellaneous Professional, Lunenburg
- Monuments, Tombstones, Markers & Memorials, Lunenburg
- Mortgage Bankers & Correspondents, Lunenburg
- Mortgage Brokers, Lunenburg
- Motor Vehicle, Lunenburg
- Motor Vehicle Rental & Leasing, Lunenburg
- Moving Companies, Lunenburg
- Moving Truck Rental , Lunenburg
- Museums, Lunenburg
- Music Entertainment, Lunenburg
- Musicians, Bands & Disc Jockeys, Lunenburg
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