- Sandwich Shop Restaurants, Rockford
- Scientific & Laboratory Equipment & Instruments, Rockford
- Screen Printing, Rockford
- Seafood Restaurants, Rockford
- Security Alarm Systems - Home & Business, Rockford
- Security Control Systems & Monitoring, Rockford - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Rockford
- Sewer & Drain Cleaning & Repair, Rockford - Drain Cleaner & Installation Services
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- Sewer Construction Contractors, Rockford - Sewer Line, Pipe Installation & Repair Services
- Shopping & Shopping Services, Rockford
- Snowmobile Repair, Parts, Sales & Service, Rockford
- Social Services & Welfare, Rockford
- Specialty Animal Services, Rockford
- Specialty Stores, Rockford
- Sporting Goods Stores, Rockford
- Submarine Sandwich Restaurants, Rockford
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