- Sales & Marketing Consultant, Locust Valley
- Seals, Locust Valley - Hermetic, Hydraulic, Mechanical, Metal, Oil, Grease, etc
- Seals O Ring, Locust Valley
- Secretarial & Court Reporting Services, Locust Valley
- Security & Surveillance System & Equipment, Locust Valley
- Security Guard & Patrol Service, Locust Valley - Bodyguard, Guard Dogs, Etc
- Security Services, Locust Valley
- Semi Precious Metals, Locust Valley
- Septic & Cesspool Building & Service, Locust Valley
- Septic & Cesspool Equipment & Supplies, Locust Valley
- Sewer & Drain Cleaning & Repair, Locust Valley - Drain Cleaner & Installation Services
- Shoe Dyers, Locust Valley
- Shoe Repair Shops, Locust Valley
- Shopping & Shopping Services, Locust Valley
- Siding Contractors, Locust Valley - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
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- Skin Care & Cosmetology Salons, Locust Valley
- Skin Care Products & Treatments, Locust Valley
- Social Services & Welfare, Locust Valley
- Special Events & Party Supply Rental, Locust Valley
- Special Interest Schools Or Instruction, Locust Valley
- Specialty Goods Storage, Locust Valley
- Specialty Stores, Locust Valley
- Sporting & Recreational Camps, Locust Valley
- Sporting Goods Stores, Locust Valley
- Sportswear Manufacturers, Locust Valley
- Sportswear Wholesale, Locust Valley
- Sprinkler System Contractors, Locust Valley - Garden & Lawn Sprinkler System Installation & Repair
- Surveyor Services, Locust Valley - Surveying Service
- Surveyors, Locust Valley
- Swimming Pools, Locust Valley
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