- Machine Shop, South Houston
- Machine Shop & Tool Repair Service, South Houston
- Machinery And Equipment Manufacturers, South Houston
- Machinery, Supplies & Equipment - Business Production Related, South Houston
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Houston
- Maintenance, Cleaning & Sanitation, South Houston
- Major Appliances, South Houston - Household & Kitchen
- Management Consultants & Services, South Houston
- Manicurists & Pedicurists, South Houston
- Manufacturing, South Houston
- Manufacturing & Industrial Consultants, South Houston
- Manufacturing Equipment & Supplies, South Houston
- Manufacturing Products, South Houston
- Marine Supplies & Equipment, South Houston - Boat Supplies
- Meat Market, Wholesale & Products, South Houston
- Medical Supplies & Equipment, South Houston
- Men's & Boys Clothing & Accessories Stores, South Houston
- Mens & Boys Jeans & Western Wear Stores, South Houston
- Metal Detecting Equipment, South Houston
- Metal Plating & Polishing, South Houston
- Metal Repair Service & Blacksmith, South Houston - Iron Works
- Metal Working Machinery, South Houston
- Mexican Food & Goods Products, South Houston
- Mexican Restaurants, South Houston
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- Mildew Removal & Control, South Houston - Mold Removal
- Millwork Contractors, South Houston
- Mini & Self Storage, South Houston
- Mirrors, South Houston - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Fabricated Wire Products Manufacturers, South Houston
- Miscellaneous Household Item Repair, South Houston
- Miscellaneous Business Services, South Houston
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, South Houston
- Miscellaneous Government, South Houston
- Miscellaneous Manufacturing, South Houston
- Miscellaneous Personal Services, South Houston
- Miscellaneous Professional, South Houston
- Mobile Home Parks & Communities , South Houston
- Money Transfer Service, South Houston
- Mortgage Bankers & Correspondents, South Houston
- Motor Vehicle, South Houston
- Motor Vehicle Rental & Leasing, South Houston
- Motorcycle Parts, Accessories & Dealers, South Houston
- Moving Companies, South Houston
- Moving Truck Rental , South Houston
- Muffler Shop & Exhaust Systems, South Houston
- Music, South Houston
- Musical Instrument Rental, South Houston - Band & Orchestra Instruments
- Musical Instruments Repair, Sales & Service, South Houston
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