- Secondary Schools, New Windsor
- Secretarial & Court Reporting Services, New Windsor
- Security & Surveillance System & Equipment, New Windsor
- Security Alarm Systems - Home & Business, New Windsor
- Security Control Systems & Monitoring, New Windsor - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, New Windsor
- Service Establishment Supplies & Equipment, New Windsor
- Sewer & Drain Cleaning & Repair, New Windsor - Drain Cleaner & Installation Services
- Shopping & Shopping Services, New Windsor
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- Shutters - Interior & Exterior, New Windsor - Wood, Vinyl, Window, Plantation Shutters, etc
- Social Clubs & Organizations, New Windsor
- Social Services & Welfare, New Windsor
- Specialty Animal Services, New Windsor
- Specialty Stores, New Windsor
- Sporting Goods Stores, New Windsor
- Sprinkler Alarm Systems, New Windsor - Fire Sprinkler Systems
- Stationery & Office Supplies, New Windsor
- Steel Manufacturers, New Windsor
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