- Safety & Security Systems & Consultants, Melville
- Safety Equipment & Supplies, Melville
- Sales & Marketing Consultant, Melville
- Sand Gravel & Aggregate, Melville
- Sandwich Shop Restaurants, Melville
- Satellite Dish Antennas & Equipment Dealers, Melville
- Savings & Loan Associations, Melville
- Savings Banks, Melville
- Saw Rental, Melville
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Melville
- Scaffolding & Aerial Lifts, Melville
- Scientific & Laboratory Equipment & Instruments, Melville
- Scientific Services, Melville
- Scientific, Engineering & Technology Associations, Melville
- Screen Printing, Melville
- Seafood Restaurants, Melville
- Seawall & Shoring Contractors, Melville
- Secondary Schools, Melville
- Secretarial & Court Reporting Services, Melville
- Security & Surveillance System & Equipment, Melville
- Security Alarm Systems - Home & Business, Melville
- Security Brokers & Dealers, Melville
- Security Control Systems & Monitoring, Melville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Melville - Bodyguard, Guard Dogs, Etc
- Security Management Consultants, Melville
- Security Services, Melville
- Semiconductors & Equipment, Melville
- Senior Citizens Service & Health Organizations, Melville
- Septic & Cesspool Building & Service, Melville
- Sewer & Drain Cleaning & Repair, Melville - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Melville
- Shelving Equipment, Melville
- Shopping & Shopping Services, Melville
- Shoring Contractors, Melville
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- Signs, Melville
- Silk Flowers & Plants Rental & Leasing, Melville
- Skin Care & Cosmetology Salons, Melville
- Skin Care Products & Treatments, Melville
- Small Appliances, Melville
- Social Clubs & Organizations, Melville
- Social Security And Disability Attorneys & Lawyers, Melville
- Social Security And Disability Lawyers & Attorneys, Melville
- Social Security Counselors & Representatives, Melville
- Social Services & Welfare, Melville
- Social Workers & Services, Melville
- Societies & Foundation Associations, Melville
- Solar Energy Research Development & Design, Melville
- Special Events & Party Supply Rental, Melville
- Special Interest Schools Or Instruction, Melville
- Specialty Animal Services, Melville
- Specialty Goods Storage, Melville
- Specialty Stores, Melville
- Sporting & Recreational Camps, Melville
- Sporting Goods Stores, Melville
- Sports & Recreational Services, Melville
- Sportswear Clothing Stores, Melville - Sports Clothes
- Staffing & Support Services, Melville
- State Government, Melville
- Steak House Restaurants, Melville
- Steel & Metal Goods, Melville - Steel Distributors
- Steel Fabrication & Processing Equipment, Melville
- Stock & Bond Brokers & Dealers, Melville
- Stocks & Bond Brokers, Melville
- Stone, Melville
- Store Fixtures & Display Equipment, Melville
- Structural Engineer, Melville
- Surveyor Services, Melville - Surveying Service
- Synagogues & Temples, Melville
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