- Machine Shop & Tool Repair Service, Lockport
- Machine Tools , Lockport
- Machinery And Equipment Manufacturers, Lockport
- Machinery, Supplies & Equipment - Business Production Related, Lockport
- Machinery, Supplies & Equipment - Business Supplies Related, Lockport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lockport
- Mailbox Rental Services, Lockport
- Mailing, Delivery & Courier Service, Lockport
- Major Appliances, Lockport - Household & Kitchen
- Malls & Shopping Centers, Lockport
- Management Consultants & Services, Lockport
- Manicurists & Pedicurists, Lockport
- Manufacturing, Lockport
- Manufacturing Products, Lockport
- Marine Contractors & Designers, Lockport
- Martial Arts & Self Defense Schools, Lockport
- Mary Kay Cosmetics, Lockport
- Masonry Contractors, Lockport - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Lockport
- Massage Therapy, Lockport
- Mechanical Contractors, Lockport - Install, Service & Repair
- Medical Diagnostic Clinics, Lockport - Clinical Labs & Centers
- Membership Sports & Recreation Clubs, Lockport
- Metal Buildings, Lockport - Kits, Homes, Steel Buildings, etc
- Metal Goods Alloys, Lockport
- Metal Specialties, Lockport
- Metal Tanks, Lockport
- Methodist Church, Lockport
- Mexican Restaurants, Lockport
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- Mining, Lockport
- Miscellaneous Household Item Repair, Lockport
- Miscellaneous Business Services, Lockport
- Miscellaneous Government, Lockport
- Miscellaneous Personal Services, Lockport
- Miscellaneous Professional, Lockport
- Modular & Mobile Homes For Sale, Lockport - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Lockport
- Mortgage Bankers & Correspondents, Lockport
- Mortgages & Loans, Lockport
- Motion Picture Pre & Post Production Services, Lockport
- Motor Vehicle, Lockport
- Motor Vehicle Rental & Leasing, Lockport
- Motorcycle & Motor Scooters Dealers, Repair & Service, Lockport
- Motorcycle Repair & Service, Lockport
- Moving & Storage Supplies & Equipment, Lockport
- Moving Companies, Lockport
- Moving Supplies & Equipment Rental, Lockport
- Moving Truck Rental , Lockport
- Muffler Shop & Exhaust Systems, Lockport
- Mulch, Peat & Moss Products, Lockport
- Multimedia Publishers, Lockport - Multimedia Services & Systems
- Museums, Lockport
- Music, Lockport
- Music Lessons, Lockport
- Music Lessons - Instrumental, Lockport
- Music Lessons - Vocal, Lockport
- Musical Instruments & Equipment Stores, Lockport
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