- Machinery, Supplies & Equipment - Business Production Related, Hornell
- Machinery, Supplies & Equipment - Business Supplies Related, Hornell
- Management Consultants & Services, Hornell
- Manicurists & Pedicurists, Hornell
- Manufacturing, Hornell
- Manufacturing Services, Hornell
- Marriage & Family Counselors, Hornell
- Masonry Materials & Supplies, Hornell
- Medical & Health Service Organizations, Hornell
- Medical Billing Services, Hornell
- Medical Supplies & Equipment, Hornell
- Membership Sports & Recreation Clubs, Hornell
- Mental Health Specialists, Hornell - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Hornell
- Mini & Self Storage, Hornell
- Mining, Hornell
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- Miscellaneous Agriculture, Hornell
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Hornell
- Miscellaneous Government, Hornell
- Miscellaneous Personal Services, Hornell
- Mobile Home Parks & Communities , Hornell
- Modular & Mobile Homes For Sale, Hornell - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Hornell
- Mortgage Bankers & Correspondents, Hornell
- Motion Picture Pre & Post Production Services, Hornell
- Motor Vehicle, Hornell
- Motor Vehicle Rental & Leasing, Hornell
- Motorcycle Parts, Accessories & Dealers, Hornell
- Moving Companies, Hornell
- Moving Truck Rental , Hornell
- Muffler Shop & Exhaust Systems, Hornell
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