- Safety & Security Systems & Consultants, Melville
- Sandwich Shop Restaurants, Melville
- School - Catholic, Melville
- School - Christian, Melville
- Scrap & Waste Materials, Melville
- Seafood Restaurants, Melville
- Secondary Schools, 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 Services, Melville
- Senior Citizens Service & Health Organizations, Melville
- Sheet Metal, Melville
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, Melville - Sheet Metal Products
- Shopping & Shopping Services, Melville
- Small Appliances, Melville
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- Social Clubs & Organizations, Melville
- Social Services & Welfare, Melville
- Societies & Foundation Associations, Melville
- Special Interest Schools Or Instruction, Melville
- Specialty Animal Services, Melville
- Specialty Goods Storage, Melville
- Specialty Stores, Melville
- Sporting Goods Stores, Melville
- Stadiums, Arenas, Coliseums & Athletic Fields, Melville
- State Government, Melville
- Stoves & Furnace Equipment, Melville - Fittings & Repair Parts
- Stucco Siding Contractors, Melville - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Melville
- Sushi Restaurants, Melville
- Swimming, Melville
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