- Machine Shop & Tool Repair Service, Center Line
- Machinery, Supplies & Equipment - Business Production Related, Center Line
- Machinery, Supplies & Equipment - Business Supplies Related, Center Line
- Machinery, Supplies & Equipment - Construction & Contractor Related, Center Line
- Major Appliances, Center Line - Household & Kitchen
- Management Consultants & Services, Center Line
- Manicurists & Pedicurists, Center Line
- Manufacturing, Center Line
- Manufacturing Products, Center Line
- Masonry Materials & Supplies, Center Line
- Massage Therapy, Center Line
- Mathematicians, Center Line
- Mechanical Contractors, Center Line - Install, Service & Repair
- Medical & Health Service Organizations, Center Line
- Medical Groups & Clinics, Center Line - Medical & Health Centers
- Medical Supplies & Equipment, Center Line
- Medical Transcription Service, Center Line
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- Men's & Boys Clothing & Accessories Stores, Center Line
- Men's Clothing Stores, Center Line - Clothes & Accessories
- Mens & Boys Belts & Suspenders, Center Line
- Metal Products, Center Line
- Metal Repair Service & Blacksmith, Center Line - Iron Works
- Metal Tanks, Center Line
- Miscellaneous Business Services, Center Line
- Miscellaneous Government, Center Line
- Miscellaneous Personal Services, Center Line
- Miscellaneous Professional, Center Line
- Monuments, Tombstones, Markers & Memorials, Center Line
- Motor Vehicle, Center Line
- Motor Vehicle Rental & Leasing, Center Line
- Motorcycle Parts, Accessories & Dealers, Center Line
- Moving Truck Rental , Center Line
- Muffler Shop & Exhaust Systems, Center Line
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