- Machine Shop, Morgan City
- Machine Shop & Tool Repair Service, Morgan City
- Machinery, Supplies & Equipment - Business Production Related, Morgan City
- Machinery, Supplies & Equipment - Business Supplies Related, Morgan City
- Machinery, Supplies & Equipment - Construction & Contractor Related, Morgan City
- Mailing, Delivery & Courier Service, Morgan City
- Major Appliances, Morgan City - Household & Kitchen
- Management Consultants & Services, Morgan City
- Manicurists & Pedicurists, Morgan City
- Manufacturing, Morgan City
- Manufacturing Products, Morgan City
- Marble, Morgan City
- Marinas & Marina Services, Morgan City
- Marine Contractors & Designers, Morgan City
- Marine Electronic Equipment, Morgan City
- Marine Products And Services, Morgan City
- Marine Repair & Service Stations, Morgan City
- Marine Salvage & Wrecking Services, Morgan City
- Marine Services, Morgan City
- Marine Supplies & Equipment, Morgan City - Boat Supplies
- Marine Supplies & Equipment Repair, Morgan City - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Morgan City
- Marriage & Family Counselors, Morgan City
- Martial Arts & Self Defense Schools, Morgan City
- Masonry Materials & Supplies, Morgan City
- Material Handling Equipment, Morgan City - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Morgan City
- Medical Groups & Clinics, Morgan City - Medical & Health Centers
- Medical Supplements, Morgan City
- Medical Supplies & Equipment, Morgan City
- Medicare Claims, Morgan City
- Membership Sports & Recreation Clubs, Morgan City
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- Mental Health Clinics, Morgan City - Treatment Centers
- Mental Health Specialists, Morgan City - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Morgan City - Kits, Homes, Steel Buildings, etc
- Metal Galvanizing, Morgan City
- Metal Heat Treating, Morgan City
- Metal Tanks, Morgan City
- Methodist Church, Morgan City
- Mexican Restaurants, Morgan City
- Minerals, Morgan City
- Mining, Morgan City
- Ministries Church, Morgan City
- Miscellaneous Business Product Repair, Morgan City
- Miscellaneous Prosthesis & Appliances, Morgan City
- Miscellaneous Agriculture, Morgan City
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Morgan City
- Miscellaneous Government, Morgan City
- Miscellaneous Personal Services, Morgan City
- Miscellaneous Photographers, Morgan City
- Miscellaneous Professional, Morgan City
- Mobile Home Insurance, Morgan City
- Mobile Home Parks & Communities , Morgan City
- Monuments, Tombstones, Markers & Memorials, Morgan City
- Mortgage Bankers & Correspondents, Morgan City
- Motor Vehicle, Morgan City
- Motor Vehicle Rental & Leasing, Morgan City
- Motorcycle Parts, Accessories & Dealers, Morgan City
- Movie Theaters, Morgan City
- Moving Truck Rental , Morgan City
- Muffler Shop & Exhaust Systems, Morgan City
- Museums, Morgan City
- Music, Morgan City
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