- Machine Shop & Tool Repair Service, Galliano
- Machinery And Equipment Manufacturers, Galliano
- Machinery, Supplies & Equipment - Business Supplies Related, Galliano
- Machinery, Supplies & Equipment - Construction & Contractor Related, Galliano
- Management Consultants & Services, Galliano
- Manufacturing, Galliano
- Marinas & Marina Services, Galliano
- Marine Contractors & Designers, Galliano
- Marine Products And Services, Galliano
- Marine Services, Galliano
- Marine Supplies & Equipment, Galliano - Boat Supplies
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- Masonry Materials & Supplies, Galliano
- Membership Sports & Recreation Clubs, Galliano
- Methodist Church, Galliano
- Mining, Galliano
- Miscellaneous Government, Galliano
- Miscellaneous Photographers, Galliano
- Miscellaneous Professional, Galliano
- Missing Persons Organizations, Galliano
- Monuments, Tombstones, Markers & Memorials, Galliano
- Mortgage Bankers & Correspondents, Galliano
- Motor Vehicle, Galliano
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