- Sandwich Shop Restaurants, Killingworth
- Seafood Restaurants, Killingworth
- Secondary Schools, Killingworth
- Security & Surveillance System & Equipment, Killingworth
- Security Alarm Systems - Home & Business, Killingworth
- Security Guard & Patrol Service, Killingworth - Bodyguard, Guard Dogs, Etc
- Security Services, Killingworth
- Septic Tank Installation & Repair, Killingworth - Septic Systems
- Septic Tank Pumping & Cleaning, Killingworth - Septic Systems
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- Septic Tanks & Septic Systems Contractors, Killingworth - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Shopping & Shopping Services, Killingworth
- Social Services & Welfare, Killingworth
- Specialty Animal Services, Killingworth
- Specialty Stores, Killingworth
- Sprinkler System Contractors, Killingworth - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Killingworth
- Stone, Killingworth
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