- Sandwich Shop Restaurants, Duncansville
- Savings & Loan Associations, Duncansville
- Savings Banks, Duncansville
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Duncansville
- Seafood Restaurants, Duncansville
- Sealcoating, Duncansville - Asphalt Sealcoating & Paving
- Security & Surveillance System & Equipment, Duncansville
- Security Alarm Systems - Home & Business, Duncansville
- Security Brokers & Dealers, Duncansville
- Security Control Systems & Monitoring, Duncansville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Duncansville
- Service Establishment Supplies & Equipment, Duncansville
- Sewage Systems, Duncansville
- Sewer Construction Contractors, Duncansville - Sewer Line, Pipe Installation & Repair Services
- Sheet Metal Contractors, Duncansville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Duncansville
- Shoe Stores, Duncansville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Duncansville
- Siding Contractors, Duncansville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Snacks & Desserts, Duncansville
- Snowmobile Dealers, Duncansville - Parts, Gear, Clothing & Accessories
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- Social Security And Disability Attorneys & Lawyers, Duncansville
- Social Security And Disability Lawyers & Attorneys, Duncansville
- Social Services & Welfare, Duncansville
- Special Interest Schools Or Instruction, Duncansville
- Specialty Animal Services, Duncansville
- Specialty Stores, Duncansville
- Sporting Goods Stores, Duncansville
- Sportswear Clothing Stores, Duncansville - Sports Clothes
- Steak House Restaurants, Duncansville
- Steel Erection Contractors, Duncansville - Steel Erectors
- Stereo, Audio & Video Equipment Dealers & Stores, Duncansville
- Stock & Bond Brokers & Dealers, Duncansville
- Stocks & Bond Brokers, Duncansville
- Stoves & Furnace Equipment, Duncansville - Fittings & Repair Parts
- Street Cleaning Services, Duncansville
- Surplus & Salvage Merchandise, Duncansville
- Surveyor Services, Duncansville - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Duncansville
- Swimming Pools Contractors, Duncansville - Install Inground - Above Ground Pools
- Swimming Pools Supplies, Equipment & Accessories, Duncansville
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