- Machine Shop & Tool Repair Service, Chatham
- Machinery, Supplies & Equipment - Business Production Related, Chatham
- Machinery, Supplies & Equipment - Construction & Contractor Related, Chatham
- Management Consultants & Services, Chatham
- Manicurists & Pedicurists, Chatham
- Manufacturing, Chatham
- Mechanical Contractors, Chatham - Install, Service & Repair
- Medical Supplies & Equipment, Chatham
- Membership Sports & Recreation Clubs, Chatham
- Mental Health Specialists, Chatham - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Chatham
- Methodist Church, Chatham
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- Mexican Restaurants, Chatham
- Military Supplies, Chatham
- Miscellaneous Household Item Repair, Chatham
- Miscellaneous Government, Chatham
- Miscellaneous Personal Services, Chatham
- Mortgage Bankers & Correspondents, Chatham
- Mortgages & Loans, Chatham
- Motor Sports, Chatham
- Motor Vehicle, Chatham
- Motor Vehicle Rental & Leasing, Chatham
- Moving Truck Rental , Chatham
- Museums, Chatham
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