- Sales & Marketing Consultant, Prospect Heights
- Sandwich Shop Restaurants, Prospect Heights
- Satellite Dish Antennas & Equipment Dealers, Prospect Heights
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Prospect Heights
- Scientific Equipment & Services, Prospect Heights
- Scientific Equipment & Supplies, Prospect Heights
- Scrapbooks & Scrapbook Supplies, Prospect Heights
- Screen Printing, Prospect Heights
- Secondary Schools, Prospect Heights
- Secretarial & Court Reporting Services, Prospect Heights
- Security & Surveillance System & Equipment, Prospect Heights
- Security Alarm Systems - Home & Business, Prospect Heights
- Security Brokers & Dealers, Prospect Heights
- Security Control Systems & Monitoring, Prospect Heights - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Prospect Heights
- Senior Citizens Housing, Prospect Heights
- Service Establishment Supplies & Equipment, Prospect Heights
- Sewer & Drain Cleaning & Repair, Prospect Heights - Drain Cleaner & Installation Services
- Shelving Equipment, Prospect Heights
- Shopping & Shopping Services, Prospect Heights
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- Siding Contractors, Prospect Heights - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Prospect Heights
- Snacks & Desserts, Prospect Heights
- Snow Removal Services, Prospect Heights - Snow Plow Service
- Social Clubs & Organizations, Prospect Heights
- Social Services & Welfare, Prospect Heights
- Societies & Foundation Associations, Prospect Heights
- Sound Systems, Microphones & Equipment, Prospect Heights
- Souvenirs & Favours, Prospect Heights
- Specialty Animal Services, Prospect Heights
- Specialty Stores, Prospect Heights
- Sporting Goods Stores, Prospect Heights
- Sports Bars & Lounges, Prospect Heights
- Staffing & Support Services, Prospect Heights
- Stock & Bond Brokers & Dealers, Prospect Heights
- Stocks & Bond Brokers, Prospect Heights
- Store Fixtures & Display Equipment, Prospect Heights
- Strapping & Strapping Equipment, Prospect Heights
- Surgical Supplies & Equipment, Prospect Heights
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