- Machine Shop & Tool Repair Service, West Middlesex
- Machinery, Supplies & Equipment - Construction & Contractor Related, West Middlesex
- Manufacturing, West Middlesex
- Manufacturing Products, West Middlesex
- Masonry Materials & Supplies, West Middlesex
- Material Handling & Heavy Machinery & Equipment, West Middlesex
- Meat Market, Wholesale & Products, West Middlesex
- Mechanical Contractors, West Middlesex - Install, Service & Repair
- Membership Sports & Recreation Clubs, West Middlesex
- Metal Buildings, West Middlesex - Wood Buildings
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- Metal Buildings, West Middlesex - Kits, Homes, Steel Buildings, etc
- Methodist Church, West Middlesex
- Miscellaneous Government, West Middlesex
- Miscellaneous Industry, West Middlesex
- Miscellaneous Photographers, West Middlesex
- Miscellaneous Professional, West Middlesex
- Mortgage Companies, West Middlesex
- Motor Vehicle, West Middlesex
- Motor Vehicle Rental & Leasing, West Middlesex
- Moving Truck Rental , West Middlesex
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