- Sand Gravel & Aggregate, Prineville
- Sandwich Shop Restaurants, Prineville
- Savings Banks, Prineville
- Sawmill & Planing Mills, Prineville
- Sawmill Supplies & Equipment Repair, Prineville
- Scrap & Waste Machinery, Prineville
- Scrap & Waste Materials, Prineville
- Screen Printing, Prineville
- Security Brokers & Dealers, Prineville
- Security Services, Prineville
- Senior Citizens Information & Services, Prineville
- Senior Citizens Service & Health Organizations, Prineville
- Septic Tanks & Systems, Prineville - Wholesale, Dealers & Suppliers
- Sewing & Yarn Stores & Supplies, Prineville
- Sheet Metal Contractors, Prineville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Prineville
- Shoe Store - More, Prineville
- Shopping & Shopping Services, Prineville
- Siding Contractors, Prineville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Prineville
- Skating Rink & Hockey Operation Services, Prineville
- Skating Rinks & Instructions, Prineville
- Sleep Disorders Treatment & Information Centers, Prineville
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- Sleep Doctors, Prineville - Specialists, Physicians & Surgeons (Sleep Medicine)
- Social Services & Welfare, Prineville
- Societies & Foundation Associations, Prineville
- Sod & Sodding Service, Prineville
- Sod Farms, Prineville
- Soil Preparation Services, Prineville
- Soil Stabilization Services, Prineville
- Special Interest Associations, Prineville
- Special Needs Transportation, Prineville
- Specialty Goods Storage, Prineville
- Specialty Stores, Prineville
- Sporting Goods Stores, Prineville
- Staffing & Support Services, Prineville
- State Government, Prineville
- Stationery & Office Supplies, Prineville
- Steak House Restaurants, Prineville
- Steel Manufacturers, Prineville
- Stitching Services, Prineville
- Stocks & Bond Brokers, Prineville
- Stoves & Furnace Equipment, Prineville - Fittings & Repair Parts
- Substance Abuse Clinics, Prineville - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Prineville - Surveying Service
- Swimming Pools, Prineville
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