- Sandwich Shop Restaurants, Thornwood
- Satellite Dish Antennas & Equipment Dealers, Thornwood
- Savings Banks, Thornwood
- School Bus Transportation Service, Thornwood
- Secondary Schools, Thornwood
- Security & Surveillance System & Equipment, Thornwood
- Security Alarm Systems - Home & Business, Thornwood
- Security Control Systems & Monitoring, Thornwood - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Thornwood
- Septic Tank Installation & Repair, Thornwood - Septic Systems
- Septic Tank Pumping & Cleaning, Thornwood - Septic Systems
- Septic Tanks & Septic Systems Contractors, Thornwood - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Service Establishment Supplies & Equipment, Thornwood
- Sewer & Drain Cleaning & Repair, Thornwood - Drain Cleaner & Installation Services
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- Shopping & Shopping Services, Thornwood
- Snacks & Desserts, Thornwood
- Snow Removal Equipment Repair & Service, Thornwood
- Social Services & Welfare, Thornwood
- Societies & Foundation Associations, Thornwood
- Special Dies Tools Jigs & Fixtures Manufacturers, Thornwood
- Specialty Stores, Thornwood
- Sporting Goods Stores, Thornwood
- Sprinkler Alarm Systems, Thornwood - Fire Sprinkler Systems
- Stationery & Office Supplies, Thornwood
- Stereo, Audio & Video Equipment Dealers & Stores, Thornwood
- Surgical Supplies & Equipment, Thornwood
- Swimming Pools, Thornwood
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