- Sandwich Shop Restaurants, Ansonia
- Satellite & Cable TV Equipment & Systems Repair & Service, Ansonia
- Savings Banks, Ansonia
- Scales Retail, Ansonia
- School - Catholic, Ansonia
- School - Christian, Ansonia
- Scrap & Waste Materials, Ansonia
- Seafood Restaurants, Ansonia
- Secondary Schools, Ansonia
- Security & Surveillance System & Equipment, Ansonia
- Security Alarm Systems - Home & Business, Ansonia
- Security Control Systems & Monitoring, Ansonia - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Ansonia
- Septic Tank Installation & Repair, Ansonia - Septic Systems
- Septic Tank Pumping & Cleaning, Ansonia - Septic Systems
- Septic Tanks & Septic Systems Contractors, Ansonia - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Ansonia - Drain Cleaner & Installation Services
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- Sheet Metal Contractors, Ansonia - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Ansonia
- Shopping & Shopping Services, Ansonia
- Siding Contractors, Ansonia - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Snack Foods, Ansonia
- Social Services & Welfare, Ansonia
- Specialty Animal Services, Ansonia
- Specialty Stores, Ansonia
- Sporting Goods Stores, Ansonia
- Sports Bars & Lounges, Ansonia
- Staffing & Support Services, Ansonia
- State Government, Ansonia
- Steak House Restaurants, Ansonia
- Steel Manufacturers, Ansonia
- Store Fixtures & Display Equipment, Ansonia
- Sushi Restaurants, Ansonia
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Ansonia
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