- Sand Gravel & Aggregate, Port Washington
- Sandwich Shop Restaurants, Port Washington
- Scientific & Laboratory Equipment & Instruments, Port Washington
- Screen Printing, Port Washington
- Screen Printing Supplies & Equipment, Port Washington
- Secondary Schools, Port Washington
- Security Brokers & Dealers, Port Washington
- Sedation Dentistry, Port Washington
- Shelving Equipment, Port Washington
- Shelving Manufacturers, Port Washington
- Sheriff's Department, Port Washington
- Shirts & T-Shirts, Port Washington
- Shoe Stores, Port Washington - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Port Washington
- Snow Removal Services, Port Washington - Snow Plow Service
- Snowmobile Dealers, Port Washington - Parts, Gear, Clothing & Accessories
- Social Services & Welfare, Port Washington
- Societies & Foundation Associations, Port Washington
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- Special Interest Schools Or Instruction, Port Washington
- Special Needs Transportation, Port Washington
- Specialty Animal Services, Port Washington
- Specialty Goods Storage, Port Washington
- Specialty Stores, Port Washington
- Sports & Recreational Services, Port Washington
- Sports Medicine, Port Washington - Doctors, Physicians & Surgeons
- Staffing & Support Services, Port Washington
- State Government, Port Washington
- Steel Manufacturers, Port Washington
- Steel Mills & Blast Furnaces, Port Washington
- Stocks & Bond Brokers, Port Washington
- Store & Retail Fixtures & Display Manufacturers, Port Washington
- Store Fixtures & Display Equipment, Port Washington
- Submarine Sandwich Restaurants, Port Washington
- Substance Abuse Clinics, Port Washington - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Port Washington
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