- Sand Gravel & Aggregate, Portland
- Sandwich Shop Restaurants, Portland
- Satellite Dish Antennas & Equipment Dealers, Portland
- Satellite TV Service, Portland
- Scrap & Waste Materials, Portland
- Seafood Restaurants, Portland
- Secondary Schools, Portland
- Security Brokers & Dealers, Portland
- Shoe Repair Shops, Portland
- Shopping & Shopping Services, Portland
- Siding Contractors, Portland - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Portland
- Social Clubs & Organizations, Portland
- Social Services & Welfare, Portland
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- Societies & Foundation Associations, Portland
- Specialty Animal Services, Portland
- Specialty Stores, Portland
- Sporting Goods Stores, Portland
- Sportswear Clothing Stores, Portland - Sports Clothes
- Staffing & Support Services, Portland
- State Government, Portland
- Steak House Restaurants, Portland
- Stock Yards, Portland
- Stocks & Bond Brokers, Portland
- Stone, Portland
- Surveyor Services, Portland - Surveying Service
- Swimming, Portland
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