- Safe & Vault, Fairfield
- Sand Gravel & Aggregate, Fairfield
- Satellite TV Service, Fairfield
- Savings Banks, Fairfield
- Scrap & Waste Materials, Fairfield
- Secondary Schools, Fairfield
- Security & Surveillance System & Equipment, Fairfield
- Security Brokers & Dealers, Fairfield
- Security Services, Fairfield
- Senior Citizens Service & Health Organizations, Fairfield
- Sewing & Yarn Stores & Supplies, Fairfield
- Sheriff's Department, Fairfield
- Shoe Store - More, Fairfield
- Shopping & Shopping Services, Fairfield
- Siding Contractors, Fairfield - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Fairfield
- Snacks & Desserts, Fairfield
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- Social Services & Welfare, Fairfield
- Special Education & Care, Fairfield
- Special Events & Party Supply Rental, Fairfield
- Specialty Animal Services, Fairfield
- Specialty Goods Storage, Fairfield
- Specialty Stores, Fairfield
- Sporting Goods Stores, Fairfield
- Stadiums, Arenas, Coliseums & Athletic Fields, Fairfield
- Staffing & Support Services, Fairfield
- State Government, Fairfield
- Steel & Metal Goods, Fairfield - Steel Distributors
- Steel Detailers, Fairfield
- Steel Work Contractors, Fairfield
- Stocks & Bond Brokers, Fairfield
- Stoves & Furnace Equipment, Fairfield - Fittings & Repair Parts
- Surveyor Services, Fairfield - Surveying Service
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