- Safety & Security Systems & Consultants, Farmingville
- Sales & Marketing Consultant, Farmingville
- Sandwich Shop Restaurants, Farmingville
- Savings Banks, Farmingville
- Security & Surveillance System & Equipment, Farmingville
- Security Management Consultants, Farmingville
- Security Services, Farmingville
- Self Defense Programs, Farmingville
- Septic & Cesspool Building & Service, Farmingville
- Sewer & Drain Cleaning & Repair, Farmingville - Drain Cleaner & Installation Services
- Sewer Cleaning Equipment & Supplies, Farmingville - Sewer Builders
- Sewing & Yarn Stores & Supplies, Farmingville
- Shoe Stores, Farmingville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Farmingville
- Snacks & Desserts, Farmingville
- Soccer Clubs, Farmingville
- Social Clubs & Organizations, Farmingville
- Social Services & Welfare, Farmingville
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- Societies & Foundation Associations, Farmingville
- Special Events & Party Supply Rental, Farmingville
- Special Interest Schools Or Instruction, Farmingville
- Specialty Stores, Farmingville
- Speech & Hearing Specialists, Farmingville
- Speech Pathologists, Farmingville - Speech & Language Therapy
- Sporting Goods Stores, Farmingville
- Sprinkler System Contractors, Farmingville - Garden & Lawn Sprinkler System Installation & Repair
- Stamp Collecting & Coin Dealers , Farmingville
- Stationery & Office Supplies, Farmingville
- Stationery Manufacturers, Farmingville
- Substance Abuse Services, Farmingville
- Swimming Pool Covers & Enclosures, Farmingville
- Swimming Pool, Sauna & Spa Contractors, Farmingville
- Swimming Pools Contractors, Farmingville - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Farmingville
- Swimming Pools Supplies, Equipment & Accessories, Farmingville
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