- Machine Shop & Tool Repair Service, Ogdensburg
- Machinery, Supplies & Equipment - Business Production Related, Ogdensburg
- Machinery, Supplies & Equipment - Business Supplies Related, Ogdensburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ogdensburg
- Mailbox Rental Services, Ogdensburg
- Mailing, Delivery & Courier Service, Ogdensburg
- Mammography Clinics, Ogdensburg - Breast Cancer Screening
- Management Consultants & Services, Ogdensburg
- Manufacturing, Ogdensburg
- Manufacturing Products, Ogdensburg
- Marinas & Marina Services, Ogdensburg
- Marine Engineers, Ogdensburg
- Marine Lifts, Launching & Recovery, Ogdensburg
- Marine Products And Services, Ogdensburg
- Marine Services, Ogdensburg
- Marriage & Family Counselors, Ogdensburg
- Masks Protective, Ogdensburg
- Masonry Materials & Supplies, Ogdensburg
- Medical & Health Service Organizations, Ogdensburg
- Medical Alert Systems, Ogdensburg - Medical Alarms - PERS
- Medical Groups & Clinics, Ogdensburg - Medical & Health Centers
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- Medical Supplies & Equipment, Ogdensburg
- Mental Health Clinics, Ogdensburg - Treatment Centers
- Mental Health Specialists, Ogdensburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Ogdensburg
- Merchandise Sales Events, Ogdensburg
- Metals, Ogdensburg
- Methodist Church, Ogdensburg
- Military Supplies, Ogdensburg
- Miscellaneous Prosthesis & Appliances, Ogdensburg
- Miscellaneous Agriculture, Ogdensburg
- Miscellaneous Government, Ogdensburg
- Miscellaneous Personal Services, Ogdensburg
- Miscellaneous Photographers, Ogdensburg
- Modular & Mobile Homes For Sale, Ogdensburg - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Ogdensburg
- Motor Vehicle, Ogdensburg
- Motor Vehicle Rental & Leasing, Ogdensburg
- Movie Theaters, Ogdensburg
- Moving & Storage Supplies & Equipment, Ogdensburg
- Moving Truck Rental , Ogdensburg
- Muffler Shop & Exhaust Systems, Ogdensburg
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