- Machine Shop & Tool Repair Service, Harrington
- Machinery, Supplies & Equipment - Business Production Related, Harrington
- Machinery, Supplies & Equipment - Business Supplies Related, Harrington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Harrington
- Management Consultants & Services, Harrington
- Manicurists & Pedicurists, Harrington
- Manufactured & Mobile Home Movers & Transporting, Harrington
- Manufacturing, Harrington
- Manufacturing Products, Harrington
- Martial Arts & Self Defense Schools, Harrington
- Masonry Materials & Supplies, Harrington
- Meat Packers, Harrington
- Membership Sports & Recreation Clubs, Harrington
- Mental Health Specialists, Harrington - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Harrington
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- Millwork Contractors, Harrington
- Mining, Harrington
- Ministries Church, Harrington
- Miscellaneous Business Product Repair, Harrington
- Miscellaneous Government, Harrington
- Miscellaneous Industry, Harrington
- Miscellaneous Personal Services, Harrington
- Miscellaneous Professional, Harrington
- Modular & Mobile Homes For Sale, Harrington - Manufactured Homes Sale & Service
- Mortgages & Loans, Harrington
- Motor Vehicle, Harrington
- Motor Vehicle Rental & Leasing, Harrington
- Moving Truck Rental , Harrington
- Museums, Harrington
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