- Sand Gravel & Aggregate, Fairfield
- Sandwich Shop Restaurants, Fairfield
- Screen Printing, Fairfield
- Seafood Restaurants, Fairfield
- Secondary Schools, Fairfield
- Senior Citizens Service & Health Organizations, Fairfield
- Sewage Plant Operation, Fairfield
- Sewer & Drain Cleaning & Repair, Fairfield - Drain Cleaner & Installation Services
- Sewer Cleaning Equipment & Supplies, Fairfield - Sewer Builders
- Sewer Companies, Fairfield
- Shopping & Shopping Services, Fairfield
- Ski Shops - Equipment & Supplies Sales & Rental, Fairfield
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- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, Fairfield
- Snacks & Desserts, Fairfield
- Snow Removal Services, Fairfield - Snow Plow Service
- Social Services & Welfare, Fairfield
- Special Interest Schools Or Instruction, Fairfield
- Specialty Animal Services, Fairfield
- Specialty Stores, Fairfield
- Sporting Goods Stores, Fairfield
- Staffing & Support Services, Fairfield
- Stone & Rock Quarry, Fairfield - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Submarine Sandwich Restaurants, Fairfield
- Substance Abuse Clinics, Fairfield - Alcoholism, Addiction & Drug Abuse Treatment Centers
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