- Machine Shop & Tool Repair Service, Lockport
- Machinery, Supplies & Equipment - Business Production Related, Lockport
- Machinery, Supplies & Equipment - Business Supplies Related, Lockport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lockport
- Mailing, Delivery & Courier Service, Lockport
- Major Appliances, Lockport - Household & Kitchen
- Manufacturers Agents & Representatives, Lockport
- Manufacturers Representative, Lockport - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Lockport
- Masonry Materials & Supplies, Lockport
- Massage Therapists & Professional, Lockport
- Massage Therapy, Lockport
- Meat Market, Wholesale & Products, Lockport
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- Membership Sports & Recreation Clubs, Lockport
- Mini & Self Storage, Lockport
- Mini Golf Courses, Lockport
- Miscellaneous Manufacturing, Lockport
- Mobile Home Parks & Communities , Lockport
- Modular & Mobile Homes For Sale, Lockport - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Lockport
- Motor Vehicle, Lockport
- Motor Vehicle Rental & Leasing, Lockport
- Moving Truck Rental , Lockport
- Music, Lockport
- Music Lessons, Lockport
- Music Lessons - Instrumental, Lockport
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