- Machine Shop & Tool Repair Service, Clayton
- Machine Tool Repair & Rebuild, Clayton
- Machinery, Supplies & Equipment - Business Production Related, Clayton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Clayton
- Management Consultants & Services, Clayton
- Manufacturing, Clayton
- Manufacturing & Industrial Consultants, Clayton
- Marinas & Marina Services, Clayton
- Marine Personnel Transportation, Clayton
- Marketing Consultants Professional Practices, Clayton
- Marriage & Family Counselors, Clayton
- Masonry Contractors, Clayton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Clayton
- Massage Therapists & Professional, Clayton
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- Massage Therapy, Clayton
- Mechanical Contractors, Clayton - Install, Service & Repair
- Medical Supplies & Equipment, Clayton
- Methodist Church, Clayton
- Mini Golf Courses, Clayton
- Miscellaneous Government, Clayton
- Miscellaneous Photographers, Clayton
- Miscellaneous Professional, Clayton
- Mobile Home Parks & Communities , Clayton
- Mortgage Bankers & Correspondents, Clayton
- Motor Vehicle, Clayton
- Motor Vehicle Rental & Leasing, Clayton
- Moving Truck Rental , Clayton
- Museums, Clayton
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