- Screens Doors & Windows, Stratford
- Security Alarm Systems - Home & Business, Stratford
- Security Control Systems & Monitoring, Stratford - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Stratford
- Senior Citizens Service & Health Organizations, Stratford
- Septic Tank Pumping & Cleaning, Stratford - Septic Systems
- Sewing Machine Repair & Service, Stratford
- Sewing Machines, Equipment & Supplies, Stratford
- Sheet Metal Contractors, Stratford - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Stratford
- Shopping & Shopping Services, Stratford
- Sleep Disorders Treatment & Information Centers, Stratford
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- Small Appliances, Stratford
- Social Services & Welfare, Stratford
- Societies & Foundation Associations, Stratford
- Solar Equipment, Stratford
- Special Events Photographers, Stratford
- Specialty Animal Services, Stratford
- Specialty Stores, Stratford
- Sporting Goods Stores, Stratford
- Sports Bars & Lounges, Stratford
- Sunroom & Solarium Construction Contractors, Stratford
- Surveyor Services, Stratford - Surveying Service
- Swimming, Stratford
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