- Machinery, Supplies & Equipment - Business Supplies Related, Brownsville
- Mail Delivery Service, Brownsville
- Management Consultants & Services, Brownsville
- Manufacturing, Brownsville
- Mechanical Contractors, Brownsville - Install, Service & Repair
- Medical Claims Processing & Assistance, Brownsville
- Membership Sports & Recreation Clubs, Brownsville
- Mennonite Church, Brownsville
- Merchandise Sales Events, Brownsville
- Mexican Restaurants, Brownsville
- Miscellaneous Retail Stores, Brownsville
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- Miscellaneous Government, Brownsville
- Miscellaneous Personal Services, Brownsville
- Motion Pictures Video Tape Duplication & Transfer Services, Brownsville
- Motor Vehicle, Brownsville
- Motor Vehicle Rental & Leasing, Brownsville
- Moving Supplies & Equipment Rental, Brownsville
- Moving Truck Rental , Brownsville
- Museums, Brownsville
- Music, Brownsville
- Musical Instruments Repair, Sales & Service, Brownsville
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