- Sand Gravel & Aggregate, Portersville
- Savings & Loan Associations, Portersville
- Savings Banks, Portersville
- Sawmill & Planing Mills, Portersville
- Sawmill Supplies & Equipment Repair, Portersville
- Scrap & Waste Machinery, Portersville
- Scrap & Waste Materials, Portersville
- Secondary Schools, Portersville
- Septic Tank Installation & Repair, Portersville - Septic Systems
- Septic Tank Pumping & Cleaning, Portersville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Portersville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Portersville - Wholesale, Dealers & Suppliers
- Sheet Metal Contractors, Portersville - Sheet Metal Fabrication
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- Sheet Metal Fabricators & Ductwork Contractors, Portersville
- Shopping & Shopping Services, Portersville
- Snacks & Desserts, Portersville
- Snowmobile Dealers, Portersville - Parts, Gear, Clothing & Accessories
- Social Security And Disability Attorneys & Lawyers, Portersville
- Social Security And Disability Lawyers & Attorneys, Portersville
- Speciality Food Stores, Portersville
- Specialty Stores, Portersville
- Specialty Vehicle Rental & Leasing, Portersville
- Sporting Goods Stores, Portersville
- Springs Automotive, Portersville
- Stone, Portersville
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