- Sand Gravel & Aggregate, Waterford
- School Bus Transportation Service, Waterford
- Security & Surveillance System & Equipment, Waterford
- Security Services, Waterford
- Senior Citizens Service & Health Organizations, Waterford
- Shopping & Shopping Services, Waterford
- Snowmobile Dealers, Waterford - Parts, Gear, Clothing & Accessories
- Social Services & Welfare, Waterford
- Societies & Foundation Associations, Waterford
- Special Interest Schools Or Instruction, Waterford
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