- Safety Equipment & Supplies, Philomath
- Sand Gravel & Aggregate, Philomath
- Sandwich Shop Restaurants, Philomath
- Satellite Dish Antennas & Equipment Dealers, Philomath
- Savings Banks, Philomath
- Sawmill & Planing Mills, Philomath
- Sawmill Supplies & Equipment Repair, Philomath
- Screen Printing, Philomath
- Sculptors, Philomath
- Secondary Schools, Philomath
- Security Brokers & Dealers, Philomath
- Security Services, Philomath
- Septic Tank Installation & Repair, Philomath - Septic Systems
- Septic Tank Pumping & Cleaning, Philomath - Septic Systems
- Septic Tanks & Septic Systems Contractors, Philomath - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Philomath - Wholesale, Dealers & Suppliers
- Sewer Construction Contractors, Philomath - Sewer Line, Pipe Installation & Repair Services
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- Sewing & Yarn Stores & Supplies, Philomath
- Shopping & Shopping Services, Philomath
- Snacks & Desserts, Philomath
- Social Services & Welfare, Philomath
- Societies & Foundation Associations, Philomath
- Specialty Animal Services, Philomath
- Specialty Goods Storage, Philomath
- Specialty Stores, Philomath
- Speech & Hearing Specialists, Philomath
- Speech Pathologists, Philomath - Speech & Language Therapy
- Sporting Goods Stores, Philomath
- State Government, Philomath
- Stocks & Bond Brokers, Philomath
- Stoves & Furnace Equipment, Philomath - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Philomath
- Surfboard & Windsurfing Equipment Shops, Philomath
- Surveyor Services, Philomath - Surveying Service
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