- Sand Gravel & Aggregate, Clarkson
- Scrap & Waste Materials, Clarkson
- Searchers Of Records, Clarkson
- Secondary Schools, Clarkson
- Security Alarm Systems - Home & Business, Clarkson
- Security Brokers & Dealers, Clarkson
- Security Control Systems & Monitoring, Clarkson - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Clarkson
- Shoe Stores, Clarkson - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Clarkson
|
- Social Clubs & Organizations, Clarkson
- Social Services & Welfare, Clarkson
- Societies & Foundation Associations, Clarkson
- Specialty Stores, Clarkson
- Sporting Goods Stores, Clarkson
- Stoves & Furnace Equipment, Clarkson - Fittings & Repair Parts
- Swimming Pool, Sauna & Spa Contractors, Clarkson
- Swimming Pools Contractors, Clarkson - Install Inground - Above Ground Pools
- Swimming Pools Supplies, Equipment & Accessories, Clarkson
|