- Safety Equipment & Supplies, Darien
- Sales & Marketing Consultant, Darien
- Salvation Army, Darien
- Sandwich Shop Restaurants, Darien
- Secondary Schools, Darien
- Secretarial & Court Reporting Services, Darien
- Security Alarm Systems - Home & Business, Darien
- Security Brokers & Dealers, Darien
- Security Services, Darien
- Sewing & Yarn Stores & Supplies, Darien
- Shopping & Shopping Services, Darien
- Shutters - Interior & Exterior, Darien - Wood, Vinyl, Window, Plantation Shutters, etc
- Signs, Darien
- Snacks & Desserts, Darien
- Social Services & Welfare, Darien
- Societies & Foundation Associations, Darien
- Special Interest Schools Or Instruction, Darien
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- Specialty Animal Services, Darien
- Specialty Stores, Darien
- Sporting & Recreational Camps, Darien
- Sporting Goods Stores, Darien
- Sports Promoters & Managers, Darien
- Sports Promotions & Special Events, Darien
- Staffing & Support Services, Darien
- Steak House Restaurants, Darien
- Stocks & Bond Brokers, Darien
- Stucco Siding Contractors, Darien - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Darien
- Substance Abuse Clinics, Darien - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Summer Camps, Darien
- Sushi Restaurants, Darien
- Swimming Pool, Sauna & Spa Contractors, Darien
- Swimming Pools, Darien
- Swimming Pools Contractors, Darien - Install Inground - Above Ground Pools
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