- Sand Gravel & Aggregate, Portland
- Sandwich Shop Restaurants, Portland
- Security & Surveillance System & Equipment, Portland
- Security Alarm Systems - Home & Business, Portland
- Security Brokers & Dealers, Portland
- Security Control Systems & Monitoring, Portland - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Portland
- Septic Tank Installation & Repair, Portland - Septic Systems
- Septic Tank Pumping & Cleaning, Portland - Septic Systems
- Septic Tanks & Septic Systems Contractors, Portland - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Portland - Drain Cleaner & Installation Services
- Sheet Metal Contractors, Portland - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Portland
- Ship & Boat Building & Repairing, Portland
- Shopping & Shopping Services, Portland
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- Siding Contractors, Portland - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Snacks & Desserts, Portland
- Snow Removal Services, Portland - Snow Plow Service
- Social Clubs & Organizations, Portland
- Social Services & Welfare, Portland
- Special Dies Tools Jigs & Fixtures Manufacturers, Portland
- Special Interest Schools Or Instruction, Portland
- Specialty Stores, Portland
- Sporting Goods Stores, Portland
- Sports & Recreational Services, Portland
- Stamp Collecting & Coin Dealers , Portland
- Steel Manufacturers, Portland
- Stocks & Bond Brokers, Portland
- Swimming Pools Management Services, Portland
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