- Sales & Marketing Consultant, Northport
- Sandwich Shop Restaurants, Northport
- Satellite & Cable TV Equipment & Systems, Northport
- Satellite TV Service, Northport
- Sawmill & Planing Mills, Northport
- Sawmill Supplies & Equipment Repair, Northport
- Seafood Restaurants, Northport
- Secondary Schools, Northport
- Secretarial & Court Reporting Services, Northport
- Security & Surveillance System & Equipment, Northport
- Security Brokers & Dealers, Northport
- Security Services, Northport
- Septic & Cesspool Building & Service, Northport
- Sewer & Drain Cleaning & Repair, Northport - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Northport - Sewer Line, Pipe Installation & Repair Services
- Sheet Metal, Northport
- Shoe Dyers, Northport
- Shoe Repair Shops, Northport
- Shopping & Shopping Services, Northport
- Siding Contractors, Northport - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Northport
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- Small Appliances, Northport
- Snacks & Desserts, Northport
- Social Clubs & Organizations, Northport
- Social Service Organizations Educational Information, Northport
- Social Services & Welfare, Northport
- Social Workers & Services, Northport
- Societies & Foundation Associations, Northport
- Special Interest Schools Or Instruction, Northport
- Specialty Animal Services, Northport
- Specialty Stores, Northport
- Sporting & Recreational Camps, Northport
- Sporting Goods Stores, Northport
- Staffing & Support Services, Northport
- State Government, Northport
- Steak House Restaurants, Northport
- Steel Erection Contractors, Northport - Steel Erectors
- Stocks & Bond Brokers, Northport
- Substance Abuse Clinics, Northport - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Substance Abuse Services, Northport
- Swimming Pool, Sauna & Spa Contractors, Northport
- Swimming Pools Contractors, Northport - Install Inground - Above Ground Pools
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