- Safety Equipment & Supplies, Durham
- Sandwich Shop Restaurants, Durham
- Scientific & Laboratory Equipment & Instruments, Durham
- Search & Navigation Equipment Manufacturers, Durham
- Security & Surveillance System & Equipment, Durham
- Security Alarm Systems - Home & Business, Durham
- Security Control Systems & Monitoring, Durham - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Durham
- Semiconductors & Equipment, Durham
- Septic Tank Installation & Repair, Durham - Septic Systems
- Septic Tank Pumping & Cleaning, Durham - Septic Systems
- Septic Tanks & Septic Systems Contractors, Durham - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sheet Metal Contractors, Durham - Sheet Metal Fabrication
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- Sheet Metal Fabricators & Ductwork Contractors, Durham
- Shopping & Shopping Services, Durham
- Snow Removal Equipment Repair & Service, Durham
- Social Services & Welfare, Durham
- Specialty Animal Services, Durham
- Specialty Stores, Durham
- Staffing & Support Services, Durham
- Staircases Stairs & Railings, Durham
- Steel & Metal Goods, Durham - Steel Distributors
- Surveyor Services, Durham - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Durham
- Swimming Pools Contractors, Durham - Install Inground - Above Ground Pools
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