- Safe & Vault, Port Washington
- Sales & Marketing Consultant, Port Washington
- Sales Promotion & Counseling Service, Port Washington
- Sandwich Shop Restaurants, Port Washington
- Satellite & Cable TV Equipment & Systems, Port Washington
- Savings & Loan Associations, Port Washington
- Savings Banks, Port Washington
- Scientific & Laboratory Equipment & Instruments, Port Washington
- Seafood Restaurants, Port Washington
- Secondary Schools, Port Washington
- Secretarial & Court Reporting Services, Port Washington
- Security & Surveillance System & Equipment, Port Washington
- Security Alarm Systems - Home & Business, Port Washington
- Security Brokers & Dealers, Port Washington
- Security Control Systems & Monitoring, Port Washington - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Port Washington
- Security Services, Port Washington
- Semiconductors & Equipment, Port Washington
- Senior Citizens Information & Services, Port Washington
- Senior Citizens Service & Health Organizations, Port Washington
- Sewer & Drain Cleaning & Repair, Port Washington - Drain Cleaner & Installation Services
- Sewer Companies, Port Washington
- Sharpening Service, Port Washington
- Ship & Yacht Broker & Agent, Port Washington
- Shipping Companies, Port Washington
- Shirts & T-Shirts, Port Washington
- Shish Kebab Restaurants, Port Washington
- Shoe Dyers, Port Washington
- Shoe Repair Shops, Port Washington
- Shoe Stores, Port Washington - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Port Washington
- Shutters - Interior & Exterior, Port Washington - Wood, Vinyl, Window, Plantation Shutters, etc
- Siding Contractors, Port Washington - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Port Washington
- Skating Rink & Hockey Operation Services, Port Washington
- Skin Care & Cosmetology Salons, Port Washington
- Skin Care Products & Treatments, Port Washington
- Small Appliances, Port Washington
- Snack Foods, Port Washington
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- Snacks & Desserts, Port Washington
- Snow Removal Equipment Repair & Service, Port Washington
- Snow Removal Services, Port Washington - Snow Plow Service
- Soccer Clubs, Port Washington
- Social Service Organizations Educational Information, Port Washington
- Social Services & Welfare, Port Washington
- Social Workers & Services, Port Washington
- Societies & Foundation Associations, Port Washington
- Special Events & Party Supply Rental, Port Washington
- Special Interest Schools Or Instruction, Port Washington
- Specialty Animal Services, Port Washington
- Specialty Goods Storage, Port Washington
- Specialty Stores, Port Washington
- Speech & Hearing Specialists, Port Washington
- Speech Pathologists, Port Washington - Speech & Language Therapy
- Sporting & Recreational Camps, Port Washington
- Sporting Goods Stores, Port Washington
- Sports & Recreational Services, Port Washington
- Sports Promoters & Managers, Port Washington
- Sportswear Clothing Stores, Port Washington - Sports Clothes
- Sprinkler System Contractors, Port Washington - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Port Washington
- Stationery & Office Supplies, Port Washington
- Steak House Restaurants, Port Washington
- Steel & Metal Goods, Port Washington - Steel Distributors
- Steel Manufacturers, Port Washington
- Stereo, Audio & Video Equipment Dealers & Stores, Port Washington
- Stock & Bond Brokers & Dealers, Port Washington
- Stocks & Bond Brokers, Port Washington
- Storage & Closet Equipment Supplies & Materials, Port Washington
- Structural Engineer, Port Washington
- Surgical Supplies & Equipment, Port Washington
- Surgical Supplies, Instruments, Tools & Equipment, Port Washington
- Sushi Restaurants, Port Washington
- Swimming Pool, Sauna & Spa Contractors, Port Washington
- Swimming Pools Contractors, Port Washington - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Port Washington
- Swimming Pools Supplies, Equipment & Accessories, Port Washington
- Synagogues & Temples, Port Washington
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