- Sandwich Shop Restaurants, Portland
- Satellite Dish Antennas & Equipment Dealers, Portland
- Scrap & Waste Materials, Portland
- Seafood Restaurants, Portland
- Secondary Schools, Portland
- Security Brokers & Dealers, Portland
- Senior Citizens Service & Health Organizations, 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
- Shirts & T-Shirts, Portland
- Shopping & Shopping Services, Portland
- Small Appliances, Portland
- Snacks & Desserts, Portland
- Social Services & Welfare, Portland
- Solar Equipment, Portland
- Sound Systems, Microphones & Equipment, Portland
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- Special Coatings, Portland - Protective Coatings
- Special Dies Tools Jigs & Fixtures Manufacturers, Portland
- Special Interest Schools Or Instruction, Portland
- Specialty Stores, Portland
- Sporting Goods Stores, Portland
- Sports Bars & Lounges, Portland
- Sports Medicine, Portland - Doctors, Physicians & Surgeons
- Staffing & Support Services, Portland
- State Government, Portland
- Steel Detailers, Portland
- Steel Manufacturers, Portland
- Steel Mills & Blast Furnaces, Portland
- Steel Work Contractors, Portland
- Stocks & Bond Brokers, Portland
- Surveyor Services, Portland - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Portland
- Swimming Pools Contractors, Portland - Install Inground - Above Ground Pools
- Swimming Pools Supplies, Equipment & Accessories, Portland
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