- Machinery, Supplies & Equipment - Construction & Contractor Related, Thornbury
- Management Consultants & Services, Thornbury
- Manufacturing, Thornbury
- Manufacturing Products, Thornbury
- Marine Supplies & Equipment, Thornbury - Boat Supplies
- Masonry Materials & Supplies, Thornbury
- Medical Supplies & Equipment, Thornbury
- Membership Sports & Recreation Clubs, Thornbury
- Men's Clothing Stores, Thornbury - Clothes & Accessories
- Mental Health Specialists, Thornbury - Psychologist, Psychiatrist, Psychotherapist, etc
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- Methodist Church, Thornbury
- Millwrights, Thornbury
- Mini & Self Storage, Thornbury
- Mining Equipment & Supplies, Thornbury
- Miscellaneous Government, Thornbury
- Miscellaneous Personal Services, Thornbury
- Miscellaneous Professional, Thornbury
- Mortgage Bankers & Correspondents, Thornbury
- Motor Vehicle, Thornbury
- Museums, Thornbury
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