- Machinery And Equipment Manufacturers, Brownsville
- Management Consultants & Services, Brownsville
- Manufacturing, Brownsville
- Marine Products And Services, Brownsville
- Marine Repair & Service Stations, Brownsville
- Marine Supplies & Equipment, Brownsville - Boat Supplies
- Marine Supplies & Equipment Repair, Brownsville - Boat Supplies & Equipment
- Medical Equipment Manufacturers, Brownsville
- Membership Sports & Recreation Clubs, Brownsville
- Mental Health Specialists, Brownsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Brownsville
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- Miscellaneous Business Product Repair, Brownsville
- Miscellaneous Government, Brownsville
- Miscellaneous Photographers, Brownsville
- Miscellaneous Professional, Brownsville
- Motor Vehicle, Brownsville
- Motor Vehicle Rental & Leasing, Brownsville
- Motorcycle Parts, Accessories & Dealers, Brownsville
- Motorcycles - Custom & Performance, Brownsville
- Moving Supplies & Equipment Rental, Brownsville
- Moving Truck Rental , Brownsville
- Museums, Brownsville
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