- Machine Shop & Tool Repair Service, Sinton
- Machinery, Supplies & Equipment - Business Production Related, Sinton
- Machinery, Supplies & Equipment - Business Supplies Related, Sinton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sinton
- Management Consultants & Services, Sinton
- Manicurists & Pedicurists, Sinton
- Manufacturing, Sinton
- Masonry Materials & Supplies, Sinton
- Medical Supplies & Equipment, Sinton
- Methodist Church, Sinton
- Mexican Food, Sinton
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- Mexican Food & Goods Products, Sinton
- Mexican Restaurants, Sinton
- Mining, Sinton
- Miscellaneous Government, Sinton
- Miscellaneous Professional, Sinton
- Monuments, Tombstones, Markers & Memorials, Sinton
- Mortgage Bankers & Correspondents, Sinton
- Motor Vehicle, Sinton
- Motor Vehicle Rental & Leasing, Sinton
- Moving Truck Rental , Sinton
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