- Sandwich Shop Restaurants, Dayton
- Savings Banks, Dayton
- Screen Printing, Dayton
- Seafood Restaurants, Dayton
- Security Alarm Systems - Home & Business, Dayton
- Security Control Systems & Monitoring, Dayton - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Dayton - Bodyguard, Guard Dogs, Etc
- Security Services, Dayton
- Semi Precious Metals, Dayton
- Septic Tanks & Septic Systems Contractors, Dayton - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sharpening Service, Dayton
- Shopping & Shopping Services, Dayton
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- Social Services & Welfare, Dayton
- Societies & Foundation Associations, Dayton
- Specialty Animal Services, Dayton
- Specialty Stores, Dayton
- Staffing & Support Services, Dayton
- Stamp Collecting & Coin Dealers , Dayton
- State Government, Dayton
- Storage Trailers & Containers, Dayton
- Surveyor Services, Dayton - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Dayton
- Swimming Pools Contractors, Dayton - Install Inground - Above Ground Pools
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