- Machine Shop, Hammondsport
- Machine Shop & Tool Repair Service, Hammondsport
- Machinery, Supplies & Equipment - Business Production Related, Hammondsport
- Machinery, Supplies & Equipment - Business Supplies Related, Hammondsport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hammondsport
- Mail Delivery Service, Hammondsport
- Major Appliances, Hammondsport - Household & Kitchen
- Manufacturing, Hammondsport
- Manufacturing Products, Hammondsport
- Marinas & Marina Services, Hammondsport
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- Marine Supplies & Equipment, Hammondsport - Boat Supplies
- Methodist Church, Hammondsport
- Micro Breweries, Hammondsport
- Miscellaneous Government, Hammondsport
- Miscellaneous Personal Services, Hammondsport
- Mortgage Bankers & Correspondents, Hammondsport
- Motor Vehicle, Hammondsport
- Motorcycle & Motor Scooters Dealers, Repair & Service, Hammondsport
- Motorcycle Repair & Service, Hammondsport
- Museums, Hammondsport
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