- Machine Shop & Tool Repair Service, Portersville
- Machinery, Supplies & Equipment - Business Production Related, Portersville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Portersville
- Major Appliances, Portersville - Household & Kitchen
- Manufacturers Agents & Representatives, Portersville
- Manufacturers Representative, Portersville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Portersville
- Manufacturing & Industrial Consultants, Portersville
- Manufacturing Products, Portersville
- Marinas & Marina Services, Portersville
- Masonry Materials & Supplies, Portersville
- Meat Market, Wholesale & Products, Portersville
- Meat Packers, Portersville
- Medical Supplies & Equipment, Portersville
- Merchandise Sales Events, Portersville
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- Metal Cutting Machines, Portersville
- Metal Working Machinery, Portersville
- Minerals, Portersville
- Mini & Self Storage, Portersville
- Miscellaneous Agriculture, Portersville
- Miscellaneous Industry, Portersville
- Miscellaneous Manufacturing, Portersville
- Miscellaneous Professional, Portersville
- Mobile Home Parks & Communities , Portersville
- Mobile Homes for Rent & Lease, Portersville
- Mortgage Companies, Portersville
- Motor Vehicle, Portersville
- Motorcycle Parts, Accessories & Dealers, Portersville
- Moving Companies, Portersville
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