- Salvage Yards, Junk Yards & Wrecker Service, Fairbury
- Sand Gravel & Aggregate, Fairbury
- Sandwich Shop Restaurants, Fairbury
- Scrap & Waste Materials, Fairbury
- Screen Printing, Fairbury
- Security & Surveillance System & Equipment, Fairbury
- Security Brokers & Dealers, Fairbury
- Seeds & Bulbs Wholesale & Growers, Fairbury
- Senior Citizens Service & Health Organizations, Fairbury
- Sewer & Drain Cleaning & Repair, Fairbury - Drain Cleaner & Installation Services
- Sheet Metal Contractors, Fairbury - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Fairbury
- Sheriff's Department, Fairbury
- Shopping & Shopping Services, Fairbury
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- Siding Contractors, Fairbury - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Fairbury
- Social Services & Welfare, Fairbury
- Specialty Animal Services, Fairbury
- Specialty Stores, Fairbury
- Sporting Goods Stores, Fairbury
- Sports Bars & Lounges, Fairbury
- Sportswear Clothing Stores, Fairbury - Sports Clothes
- State Government, Fairbury
- Steak House Restaurants, Fairbury
- Stocks & Bond Brokers, Fairbury
- Submarine Sandwich Restaurants, Fairbury
- Substance Abuse Clinics, Fairbury - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Support Services, Fairbury
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