- Machine Shop, Lockport
- Machine Shop & Tool Repair Service, Lockport
- Machinery, Supplies & Equipment - Business Supplies Related, Lockport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lockport
- Major Appliances, Lockport - Household & Kitchen
- Management Consultants & Services, Lockport
- Manicurists & Pedicurists, Lockport
- Manufacturing, Lockport
- Marine Contractors & Designers, Lockport
- Marine Products And Services, Lockport
- Marine Services, Lockport
- Marine Supplies & Equipment, Lockport - Boat Supplies
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- Marine Surveyors & Adjustors, Lockport
- Markets & Grocers Equipment, Lockport
- Meters Repair, Lockport
- Mining, Lockport
- Miscellaneous Government, Lockport
- Miscellaneous Photographers, Lockport
- Miscellaneous Professional, Lockport
- Mortgage Bankers & Correspondents, Lockport
- Motor Vehicle, Lockport
- Motor Vehicle Rental & Leasing, Lockport
- Moving Truck Rental , Lockport
- Museums, Lockport
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