- Satellite & Cable TV Equipment & Systems, Plattsburg
- Satellite TV Service, Plattsburg
- Savings Banks, Plattsburg
- Secondary Schools, Plattsburg
- Security Services, Plattsburg
- Senior Citizens Service & Health Organizations, Plattsburg
- Sewer & Drain Cleaning & Repair, Plattsburg - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Plattsburg
- Sheriff's Department, Plattsburg
- Shopping & Shopping Services, Plattsburg
- Social Security Counselors & Representatives, Plattsburg
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- Social Services & Welfare, Plattsburg
- Societies & Foundation Associations, Plattsburg
- Specialty Animal Services, Plattsburg
- Specialty Stores, Plattsburg
- Sports Bars & Lounges, Plattsburg
- State Government, Plattsburg
- Steel & Metal Goods, Plattsburg - Steel Distributors
- Stone & Rock Quarry, Plattsburg - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Swimming Pool, Sauna & Spa Contractors, Plattsburg
- Swimming Pools Contractors, Plattsburg - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Plattsburg
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