- Safety & Security Systems & Consultants, Sidney
- Sand Gravel & Aggregate, Sidney
- Sandblasting, Sidney - General Contractors
- Sandwich Shop Restaurants, Sidney
- Satellite Dish Antennas & Equipment Dealers, Sidney
- Savings & Loan Associations, Sidney
- Savings Banks, Sidney
- Scrap & Waste Materials, Sidney
- Screen Printing, Sidney
- Secondary Schools, Sidney
- Security Brokers & Dealers, Sidney
- Senior Citizens Service & Health Organizations, Sidney
- Septic Tanks & Systems, Sidney - Wholesale, Dealers & Suppliers
- Sewer & Drain Cleaning & Repair, Sidney - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Sidney - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Sidney
- Sheriff's Department, Sidney
- Shoe Stores, Sidney - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Sidney
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- Siding Contractors, Sidney - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Sidney
- Small Appliances, Sidney
- Snacks & Desserts, Sidney
- Social Services & Welfare, Sidney
- Societies & Foundation Associations, Sidney
- Special Education & Care, Sidney
- Specialty Animal Services, Sidney
- Specialty Stores, Sidney
- Sporting & Recreational Camps, Sidney
- Sporting Goods Stores, Sidney
- Staffing & Support Services, Sidney
- State Government, Sidney
- Steak House Restaurants, Sidney
- Steel Manufacturers, Sidney
- Stock & Bond Brokers & Dealers, Sidney
- Stocks & Bond Brokers, Sidney
- Substance Abuse Clinics, Sidney - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Swimming Pools, Sidney
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