- Sand Gravel & Aggregate, Portland
- Sawdust & Shavings, Portland
- Science & Research, Portland
- Scrap & Waste Materials, Portland
- Secondary Schools, Portland
- Security Brokers & Dealers, Portland
- Seeds & Bulbs Wholesale & Growers, 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
- Sewing Machine Repair & Service, Portland
- Shopping & Shopping Services, Portland
- Signs, Portland
- Snacks & Desserts, Portland
- Snow Removal Services, Portland - Snow Plow Service
- Social Security And Disability Attorneys & Lawyers, Portland
- Social Security And Disability Lawyers & Attorneys, Portland
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- Social Services & Welfare, Portland
- Societies & Foundation Associations, Portland
- Sound Systems, Microphones & Equipment, Portland
- Soup & Salad Restaurants, Portland
- Special Interest Schools Or Instruction, Portland
- Specialty Animal Services, Portland
- Specialty Stores, Portland
- Speech & Hearing Specialists, Portland
- Sporting Goods Stores, Portland
- State Government, Portland
- Steel & Metal Goods, Portland - Steel Distributors
- Stocks & Bond Brokers, Portland
- Stoves & Furnace Equipment, Portland - Fittings & Repair Parts
- Substance Abuse Clinics, Portland - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Portland - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Portland
- Swimming Pools Contractors, Portland - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Portland
- Swimming Pools Supplies, Equipment & Accessories, Portland
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