- Machine Shop & Tool Repair Service, Oxford
- Machine Tool Repair & Rebuild, Oxford
- Machinery And Equipment Manufacturers, Oxford
- Machinery Custom Design Manufacturers, Oxford
- Machinery, Supplies & Equipment - Business Production Related, Oxford
- Machinery, Supplies & Equipment - Business Supplies Related, Oxford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oxford
- Major Appliances, Oxford - Household & Kitchen
- Management Consultants & Services, Oxford
- Manicurists & Pedicurists, Oxford
- Manufacturing, Oxford
- Manufacturing Products, Oxford
- Masonry Contractors, Oxford - Stone Mason, Brick Mason - Install & Repair
- Massage Equipment & Supplies, Oxford
- Massage Therapy, Oxford
- Mechanical Engineer, Oxford - Mechanical Engineering Service
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- Medical Research, Oxford
- Medical Research & Development, Oxford - Medical Information & Research
- Medical Supplies & Equipment, Oxford
- Membership Sports & Recreation Clubs, Oxford
- Metal Finishers, Oxford
- Metal Plating & Polishing, Oxford
- Miscellaneous Business Services, Oxford
- Miscellaneous Government, Oxford
- Miscellaneous Manufacturing, Oxford
- Miscellaneous Professional, Oxford
- Moldings Materials, Oxford
- Mortgage Bankers & Correspondents, Oxford
- Mortgage Companies, Oxford
- Motor Vehicle, Oxford
- Moving Companies, Oxford
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