- Machinery, Supplies & Equipment - Construction & Contractor Related, San Antonio
- Mail Delivery Service, San Antonio
- Major Appliances, San Antonio - Household & Kitchen
- Manufacturing, San Antonio
- Manufacturing Products, San Antonio
- Masonry Materials & Supplies, San Antonio
- Mass Transit Vehicle Dealers, San Antonio
- Medical Supplies & Equipment, San Antonio
- Membership Sports & Recreation Clubs, San Antonio
- Metal Products, San Antonio
- Methodist Church, San Antonio
- Mexican Restaurants, San Antonio
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- Millwork Contractors, San Antonio
- Mini & Self Storage, San Antonio
- Mining, San Antonio
- Mining Contractors, San Antonio - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, San Antonio - Mining Companies
- Miscellaneous Government, San Antonio
- Miscellaneous Industry, San Antonio
- Mission Churches, San Antonio
- Mortgages & Loans, San Antonio
- Motor Vehicle, San Antonio
- Motor Vehicle Rental & Leasing, San Antonio
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