- Machine Shop & Tool Repair Service, Ithaca
- Machinery Repair & Rebuild, Ithaca
- Machinery, Supplies & Equipment - Business Production Related, Ithaca
- Machinery, Supplies & Equipment - Business Supplies Related, Ithaca
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ithaca
- Management Consultants & Services, Ithaca
- Manufacturing, Ithaca
- Manufacturing Products, Ithaca
- Marinas & Marina Services, Ithaca
- Marine Products And Services, Ithaca
- Marine Repair & Service Stations, Ithaca
- Marine Supplies & Equipment, Ithaca - Boat Supplies
- Marine Supplies & Equipment Repair, Ithaca - Boat Supplies & Equipment
- Marketing, Ithaca
- Masonry Materials & Supplies, Ithaca
- Massage Therapy, Ithaca
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- Meat Market, Wholesale & Products, Ithaca
- Mennonite Church, Ithaca
- Mental Health Clinics, Ithaca - Treatment Centers
- Metal Products, Ithaca
- Methodist Church, Ithaca
- Mexican Restaurants, Ithaca
- Miscellaneous Agriculture, Ithaca
- Miscellaneous Government, Ithaca
- Miscellaneous Industry, Ithaca
- Miscellaneous Manufacturing, Ithaca
- Miscellaneous Photographers, Ithaca
- Miscellaneous Professional, Ithaca
- Mobile Home Parks & Communities , Ithaca
- Mortgage Bankers & Correspondents, Ithaca
- Motor Vehicle, Ithaca
- Muffler Shop & Exhaust Systems, Ithaca
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