- Safe & Vault, East Northport
- Safety & Security Systems & Consultants, East Northport
- Salvage Yards, Junk Yards & Wrecker Service, East Northport
- Salvation Army, East Northport
- Sandwich Shop Restaurants, East Northport
- Satellite Dish Antennas & Equipment Dealers, East Northport
- Satellite TV Service, East Northport
- Savings & Loan Associations, East Northport
- Savings Banks, East Northport
- School Bus Transportation Service, East Northport
- Scrap & Waste Materials, East Northport
- Screen Printing, East Northport
- Seafood Restaurants, East Northport
- Sealcoating, East Northport - Asphalt Sealcoating & Paving
- Secondary Schools, East Northport
- Secretarial & Court Reporting Services, East Northport
- Security & Surveillance System & Equipment, East Northport
- Security Alarm Systems - Home & Business, East Northport
- Security Brokers & Dealers, East Northport
- Security Control Systems & Monitoring, East Northport - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, East Northport - Bodyguard, Guard Dogs, Etc
- Security Services, East Northport
- Self Defense Programs, East Northport
- Septic & Cesspool Building & Service, East Northport
- Service Station Equipment - Installation, Repair & Maintenance, East Northport
- Sewer & Drain Cleaning & Repair, East Northport - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, East Northport
- Shoe Dyers, East Northport
- Shoe Repair Shops, East Northport
- Shoe Store - More, East Northport
- Shoe Stores, East Northport - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, East Northport
- Siding Contractors, East Northport - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Small Appliances, East Northport
- Smoothie Restaurants, East Northport
- Snacks & Desserts, East Northport
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- Snow Removal Services, East Northport - Snow Plow Service
- Social Services & Welfare, East Northport
- Social Workers & Services, East Northport
- Societies & Foundation Associations, East Northport
- Sod & Sodding Service, East Northport
- Sod Farms, East Northport
- Special Events & Party Supply Rental, East Northport
- Special Interest Schools Or Instruction, East Northport
- Specialty Animal Services, East Northport
- Specialty Stores, East Northport
- Speech & Hearing Specialists, East Northport
- Speech Pathologists, East Northport - Speech & Language Therapy
- Sporting Goods Equipment Rental, East Northport
- Sporting Goods Stores, East Northport
- Sports Clubs, East Northport
- Sportswear Manufacturers, East Northport
- Sprinkler System Contractors, East Northport - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, East Northport
- Stairs & Railings Contractors, East Northport - Metal & Wood Stairs, Spiral Staircase & Stair Railing - Installation & Repair
- Stairs, Balcony, Terrace & Steeple Contractors, East Northport
- Stitching Services, East Northport
- Stock & Bond Brokers & Dealers, East Northport
- Stocks & Bond Brokers, East Northport
- Store Fronts, East Northport - Storefront
- Surgical Supplies & Equipment, East Northport
- Surgical Supplies, Instruments, Tools & Equipment, East Northport
- Sushi Restaurants, East Northport
- Swimming, East Northport
- Swimming Pool Covers & Enclosures, East Northport
- Swimming Pool, Sauna & Spa Contractors, East Northport
- Swimming Pools Contractors, East Northport - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, East Northport
- Swimming Pools Supplies, Equipment & Accessories, East Northport
- Swimwear & Accessories Shops, East Northport - Water Sports Equipment
- Synagogues & Temples, East Northport
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