- Machine Shop & Tool Repair Service, Port Allen
- Machine Shop Equipment & Supplies, Port Allen
- Machinery, Supplies & Equipment - Business Production Related, Port Allen
- Machinery, Supplies & Equipment - Business Supplies Related, Port Allen
- Machinery, Supplies & Equipment - Construction & Contractor Related, Port Allen
- Management Consultants & Services, Port Allen
- Manicurists & Pedicurists, Port Allen
- Manufacturing, Port Allen
- Manufacturing & Industrial Consultants, Port Allen
- Manufacturing Products, Port Allen
- Marine Cargo Handling, Port Allen
- Masonry Materials & Supplies, Port Allen
- Massage Therapy, Port Allen
- Material Handling Equipment, Port Allen - Conveyor Belt, Pallet Jack, Forklift, etc
- Mats & Matting, Port Allen
- Meat Market, Wholesale & Products, Port Allen
- Medical Equipment Manufacturers, Port Allen
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Port Allen
- Medical Research, Port Allen
- Medical Research & Development, Port Allen - Medical Information & Research
- Membership Sports & Recreation Clubs, Port Allen
- Mental Health Clinics, Port Allen - Treatment Centers
- Merle Norman Cosmetics, Port Allen
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- Metal Coating & Allied Services, Port Allen
- Metal Galvanizing, Port Allen
- Metal Products, Port Allen
- Metal Repair Service & Blacksmith, Port Allen - Iron Works
- Methodist Church, Port Allen
- Mining, Port Allen
- Ministries Church, Port Allen
- Miscellaneous Fabricated Wire Products Manufacturers, Port Allen
- Miscellaneous Agriculture, Port Allen
- Miscellaneous Government, Port Allen
- Miscellaneous Industry, Port Allen
- Miscellaneous Photographers, Port Allen
- Miscellaneous Professional, Port Allen
- Mission Churches, Port Allen
- Mobile Home Parks & Communities , Port Allen
- Modular & Mobile Homes For Sale, Port Allen - Manufactured Homes Sale & Service
- Motor Vehicle, Port Allen
- Motor Vehicle Rental & Leasing, Port Allen
- Moving Companies, Port Allen
- Moving Services - Labor & Material, Port Allen
- Moving Truck Rental , Port Allen
- Mulch, Peat & Moss Products, Port Allen
- Museums, Port Allen
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