- Safe & Vault, Seaford
- Safes & Vaults Movers, Seaford
- Sales & Marketing Consultant, Seaford
- Sandwich Shop Restaurants, Seaford
- Savings Banks, Seaford
- School - Catholic, Seaford
- School - Christian, Seaford
- School Uniforms, Seaford
- Scientific Equipment & Services, Seaford
- Scientific Services, Seaford
- Screen Printing, Seaford
- Seafood Restaurants, Seaford
- Sealcoating, Seaford - Asphalt Sealcoating & Paving
- Secondary Schools, Seaford
- Security & Surveillance System & Equipment, Seaford
- Security Alarm Systems - Home & Business, Seaford
- Security Brokers & Dealers, Seaford
- Security Control Systems & Monitoring, Seaford - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Seaford
- Sewer & Drain Cleaning & Repair, Seaford - Drain Cleaner & Installation Services
- Ship & Boat Building & Repairing, Seaford
- Shopping & Shopping Services, Seaford
- Siding Materials, Seaford
- Signs, Seaford
- Small Appliances, Seaford
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- Snacks & Desserts, Seaford
- Social Clubs & Organizations, Seaford
- Social Services & Welfare, Seaford
- Social Workers & Services, Seaford
- Spare Rib Restaurants, Seaford
- Special Education & Care, Seaford
- Special Events & Party Supply Rental, Seaford
- Special Interest Schools Or Instruction, Seaford
- Specialty Animal Services, Seaford
- Specialty Stores, Seaford
- Sporting Goods Stores, Seaford
- Sports & Recreational Services, Seaford
- Sportswear Manufacturers, Seaford
- Sprinkler System Contractors, Seaford - Garden & Lawn Sprinkler System Installation & Repair
- Stadiums, Arenas, Coliseums & Athletic Fields, Seaford
- Stamp Dealers & Collectors Supplies, Seaford
- Stocks & Bond Brokers, Seaford
- Storm Doors & Windows, Seaford
- Substance Abuse Clinics, Seaford - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Seaford - Surveying Service
- Sweepers & Scrubbers Industrial, Seaford - Sweeping Service
- Swimming Pool, Sauna & Spa Contractors, Seaford
- Swimming Pools Contractors, Seaford - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Seaford
- Swimming Pools Supplies, Equipment & Accessories, Seaford
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