- Safety & Security Systems & Consultants, Portland
- Sand Gravel & Aggregate, Portland
- Sandwich Shop Restaurants, Portland
- Satellite & Cable TV Equipment & Systems, Portland
- Satellite TV Service, Portland
- Savings Banks, Portland
- Secondary Schools, 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
- Senior Citizens Housing, Portland
- Senior Citizens Service & Health Organizations, Portland
- Sewer & Drain Cleaning & Repair, Portland - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Portland
- Sewing Contractors, Portland
- Sewing Machines, Equipment & Supplies, Portland
- Shopping & Shopping Services, Portland
- Signs, Portland
- Sleep Disorders Treatment & Information Centers, Portland
- Small Appliances, Portland
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- Smelters & Refiners Base Metals, Portland
- Smelters & Refiners Precious Metals, Portland
- Snacks & Desserts, Portland
- Social Security Counselors & Representatives, Portland
- Social Services & Welfare, Portland
- Societies & Foundation Associations, Portland
- Sound Systems, Microphones & Equipment, Portland
- Special Interest Schools Or Instruction, Portland
- Specialty Animal Services, Portland
- Specialty Communication Companies & Services, Portland
- Specialty Goods Storage, Portland
- Specialty Stores, Portland
- Speech & Hearing Specialists, Portland
- Speech Pathologists, Portland - Speech & Language Therapy
- Sporting Goods Stores, Portland
- Sports Medicine, Portland - Doctors, Physicians & Surgeons
- Stationery & Office Supplies, Portland
- Steak House Restaurants, Portland
- Stocks & Bond Brokers, Portland
- Stone, Portland
- Swimming Pools, Portland
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Portland
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