- Safe & Vault, Smithtown
- Sales & Marketing Consultant, Smithtown
- Sandblasting, Smithtown - General Contractors
- Sandwich Shop Restaurants, Smithtown
- Satellite Descrambling & Programming Service, Smithtown
- Satellite Dish Antennas & Equipment Dealers, Smithtown
- Satellite TV Service, Smithtown
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Smithtown
- Scientific Equipment & Services, Smithtown
- Scientific Services, Smithtown
- Sculptors, Smithtown
- Seafood Restaurants, Smithtown
- Sealcoating, Smithtown - Asphalt Sealcoating & Paving
- Secondary Schools, Smithtown
- Security & Surveillance System & Equipment, Smithtown
- Security Alarm Systems - Home & Business, Smithtown
- Security Brokers & Dealers, Smithtown
- Security Control Systems & Monitoring, Smithtown - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Smithtown - Bodyguard, Guard Dogs, Etc
- Security Investigative Services, Smithtown
- Security Services, Smithtown
- Self Defense Programs, Smithtown
- Senior Citizens Centers & Meals, Smithtown
- Senior Citizens Housing, Smithtown
- Senior Citizens Service & Health Organizations, Smithtown
- Septic & Cesspool Building & Service, Smithtown
- Sewer & Drain Cleaning & Repair, Smithtown - Drain Cleaner & Installation Services
- Shoe Dyers, Smithtown
- Shoe Repair Shops, Smithtown
- Shoe Stores, Smithtown - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Smithtown
- Siding Contractors, Smithtown - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Smithtown
- Ski Centers, Smithtown
- Ski Resorts, Smithtown
- Skin Care & Cosmetology Salons, Smithtown
- Skin Care Products & Treatments, Smithtown
- Small Appliances, Smithtown
- Smoothie Restaurants, Smithtown
- Snacks & Desserts, Smithtown
- Snow Removal Services, Smithtown - Snow Plow Service
- Soccer Clubs, Smithtown
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- Social Service Organizations Volunteer Services, Smithtown
- Social Services & Welfare, Smithtown
- Social Workers & Services, Smithtown
- Societies & Foundation Associations, Smithtown
- Solar Energy Companies - Contractors, Smithtown - Solar Panel Installation - Solar Power Systems
- Solar Energy Equipment & Systems - Service & Repair, Smithtown - Solar Power Systems
- Special Events & Party Supply Rental, Smithtown
- Special Interest Schools Or Instruction, Smithtown
- Specialty Animal Services, Smithtown
- Specialty Stores, Smithtown
- Speech & Hearing Specialists, Smithtown
- Speech Pathologists, Smithtown - Speech & Language Therapy
- Sporting Goods Manufacturers, Smithtown
- Sporting Goods Stores, Smithtown
- Sports Medicine, Smithtown - Doctors, Physicians & Surgeons
- Sprinkler System Contractors, Smithtown - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Smithtown
- Stamp Collecting & Coin Dealers , Smithtown
- State Government, Smithtown
- Steak House Restaurants, Smithtown
- Stereo Parts & Supplies, Smithtown
- Stereo, Audio & Video Equipment Dealers & Stores, Smithtown
- Stock & Bond Brokers & Dealers, Smithtown
- Stocks & Bond Brokers, Smithtown
- Stone Setting Contractors, Smithtown
- Store Fronts, Smithtown - Storefront
- Storm Windows & Doors Installation & Repair, Smithtown
- Substance Abuse Clinics, Smithtown - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Sunrooms & Solarium Construction Contractors, Smithtown - Build & Repair
- Sunrooms, Greenhouses, Solariums & Atrium Builders, Smithtown - Build & Repair
- Support Services, Smithtown
- Surgical Supplies & Equipment, Smithtown
- Surgical Supplies, Instruments, Tools & Equipment, Smithtown
- Surveyor Services, Smithtown - Surveying Service
- Sushi Restaurants, Smithtown
- Swimming Pool Covers & Enclosures, Smithtown
- Swimming Pool, Sauna & Spa Contractors, Smithtown
- Swimming Pools & Equipment Manufacturers, Smithtown
- Swimming Pools Contractors, Smithtown - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Smithtown
- Swimming Pools Supplies, Equipment & Accessories, Smithtown
- Synagogues & Temples, Smithtown
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