- Machine Shop & Tool Repair Service, Lockport
- Machine Tool Repair & Rebuild, Lockport
- Machine Tools , Lockport
- Machinery And Equipment Manufacturers, Lockport
- Machinery Custom Design Manufacturers, Lockport
- Machinery, Supplies & Equipment - Business Production Related, Lockport
- Machinery, Supplies & Equipment - Business Supplies Related, Lockport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lockport
- Magazine & Newspaper Stands, Lockport - Dealers & Distributors
- Mail Delivery Service, Lockport
- Mailbox Rental Services, Lockport
- Mailing, Delivery & Courier Service, Lockport
- Maintenance, Cleaning & Sanitation, Lockport
- Major Appliance Repair & Service, Lockport
- Major Appliances, Lockport - Household & Kitchen
- Mammography Clinics, Lockport - Breast Cancer Screening
- Management Consultants & Services, Lockport
- Manicurists & Pedicurists, Lockport
- Manufacturers Agents & Representatives, Lockport
- Manufacturers Representative, Lockport - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Lockport
- Manufacturing Equipment & Supplies, Lockport
- Manufacturing Products, Lockport
- Marriage & Family Counselors, Lockport
- Martial Arts & Self Defense Schools, Lockport
- Masonry Materials & Supplies, Lockport
- Massage Therapists & Professional, Lockport
- Massage Therapy, Lockport
- Material Handling & Heavy Machinery & Equipment, Lockport
- Material Handling Equipment, Lockport - Conveyor Belt, Pallet Jack, Forklift, etc
- Mausoleums Developers, Lockport
- Mechanical Contractors, Lockport - Install, Service & Repair
- Mechanical Engineer, Lockport - Mechanical Engineering Service
- Medical Supplies & Equipment, Lockport
- Membership Sports & Recreation Clubs, Lockport
- Mental Health Specialists, Lockport - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Lockport - Kits, Homes, Steel Buildings, etc
- Metal Goods Alloys, Lockport
- Metal Heat Treating, Lockport
- Metal Repair Service & Blacksmith, Lockport - Iron Works
- Metal Roofs, Lockport
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- Metal Specialties, Lockport
- Metals Clad, Lockport
- Methodist Church, Lockport
- Mexican Restaurants, Lockport
- Mini & Self Storage, Lockport
- Mining, Lockport
- Mirrors, Lockport - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Lockport
- Miscellaneous Agriculture, Lockport
- Miscellaneous Business Services, Lockport
- Miscellaneous Government, Lockport
- Miscellaneous Manufacturing, Lockport
- Miscellaneous Personal Services, Lockport
- Miscellaneous Photographers, Lockport
- Miscellaneous Professional, Lockport
- Mobile Home Contractors, Lockport
- Mobile Home Improvements & Repairs, Lockport
- Mobile Home Parks & Communities , Lockport
- Modular & Mobile Homes For Sale, Lockport - Manufactured Homes Sale & Service
- Monuments Cleaning, Lockport
- Monuments, Tombstones, Markers & Memorials, Lockport
- Mortgage Bankers & Correspondents, Lockport
- Mortgages & Loans, Lockport
- Motion Picture & Television Production Services, Lockport
- Motion Picture Pre & Post Production Services, Lockport
- Motor Vehicle, Lockport
- Motor Vehicle Rental & Leasing, Lockport
- Motorcycle & Motor Scooters Dealers, Repair & Service, Lockport
- Motorcycle Parts, Accessories & Dealers, Lockport
- Motorcycle Repair & Service, Lockport
- Movie Theaters, Lockport
- Moving & Storage Supplies & Equipment, Lockport
- Moving Companies, Lockport
- Moving Truck Rental , Lockport
- Muffler Shop & Exhaust Systems, Lockport
- Museums, Lockport
- Music, Lockport
- Music Lessons, Lockport
- Music Lessons - Instrumental, Lockport
- Musical Instruments & Equipment Stores, Lockport
- Musical Instruments Repair, Sales & Service, Lockport
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