- Machine Shop & Tool Repair Service, Longville
- Machinery Movers & Erectors, Longville
- Machinery, Supplies & Equipment - Business Production Related, Longville
- Machinery, Supplies & Equipment - Business Supplies Related, Longville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Longville
- Mail Delivery Service, Longville
- Management Consultants & Services, Longville
- Manufacturing, Longville
- Marine Products And Services, Longville
- Marine Services, Longville
- Marine Supplies & Equipment, Longville - Boat Supplies
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- Masonry Contractors, Longville - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Longville
- Massage Therapy, Longville
- Metal Repair Service & Blacksmith, Longville - Iron Works
- Mini Golf Courses, Longville
- Miscellaneous Business Services, Longville
- Monuments, Tombstones, Markers & Memorials, Longville
- Mortgage Bankers & Correspondents, Longville
- Mortgage Companies, Longville
- Motor Vehicle, Longville
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