- Safe & Vault, Darien
- Sales & Marketing Consultant, Darien
- Sandwich Shop Restaurants, Darien
- Satellite Dish Antennas & Equipment Dealers, Darien
- Satellite TV Service, Darien
- Savings Banks, Darien
- Seafood Restaurants, Darien
- Secondary Schools, Darien
- Security Brokers & Dealers, Darien
- Security Services, Darien
- Sewer & Drain Cleaning & Repair, Darien - Drain Cleaner & Installation Services
- Sewing Machine Repair & Service, Darien
- Sheet Metal Contractors, Darien - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Darien
- Ship & Yacht Broker & Agent, Darien
- Shoe Dyers, Darien
- Shoe Repair Shops, Darien
- Shopping & Shopping Services, Darien
- Siding Contractors, Darien - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Darien
- Skating Rink & Hockey Operation Services, Darien
- Skin Care & Cosmetology Salons, Darien
- Skin Care Products & Treatments, Darien
- Snacks & Desserts, Darien
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- Social Clubs & Organizations, Darien
- Social Services & Welfare, Darien
- Social Workers & Services, Darien
- Societies & Foundation Associations, Darien
- Special Interest Schools Or Instruction, Darien
- Special Needs Transportation, Darien
- Speciality Food Stores, Darien
- Specialty Animal Services, Darien
- Specialty Stores, Darien
- Sporting Goods Stores, Darien
- Sportswear Clothing Stores, Darien - Sports Clothes
- Sprinkler System Contractors, Darien - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Darien
- Steel Manufacturers, Darien
- Steel Mills & Blast Furnaces, Darien
- Stock & Bond Brokers & Dealers, Darien
- Stocks & Bond Brokers, Darien
- Substance Abuse Clinics, Darien - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Darien - Surveying Service
- Surveyors, Darien
- Swimming Pool, Sauna & Spa Contractors, Darien
- Swimming Pools Contractors, Darien - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Darien
- Swimming Pools Supplies, Equipment & Accessories, Darien
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