- Sales & Marketing Consultant, Cos Cob
- Sand Spreading Contractors, Cos Cob
- Seafood Restaurants, Cos Cob
- Secondary Schools, Cos Cob
- Security Guard & Patrol Service, Cos Cob - Bodyguard, Guard Dogs, Etc
- Security Services, Cos Cob
- Shooting & Target Ranges, Cos Cob
- Shopping & Shopping Services, Cos Cob
- Small Appliances, Cos Cob
- Snacks & Desserts, Cos Cob
- Social Clubs & Organizations, Cos Cob
- Social Services & Welfare, Cos Cob
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- Soup & Salad Restaurants, Cos Cob
- Special Events & Party Supply Rental, Cos Cob
- Special Interest Schools Or Instruction, Cos Cob
- Specialty Stores, Cos Cob
- Sporting Goods Stores, Cos Cob
- Sports & Recreational Services, Cos Cob
- Sprinkler System Contractors, Cos Cob - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Cos Cob
- Stamp Collecting & Coin Dealers , Cos Cob
- Structural Engineer, Cos Cob
- Surveyor Services, Cos Cob - Surveying Service
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