- Safety Equipment & Supplies, Durham
- Salted & Roasted Nuts & Seeds Manufacturers, Durham
- Sandblasting, Durham - General Contractors
- Scrap & Waste Materials, Durham
- Secondary Schools, Durham
- Security Alarm Systems - Home & Business, Durham
- Security Control Systems & Monitoring, Durham - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Durham
- Septic Tank Pumping & Cleaning, Durham - Septic Systems
- Septic Tank Site Evaluation & Design Consultants, Durham
- Septic Tanks & Septic Systems Contractors, Durham - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Durham - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Durham
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- Snack Foods, Durham
- Social Services & Welfare, Durham
- Solar Energy Companies - Contractors, Durham - Solar Panel Installation - Solar Power Systems
- Solar Energy Equipment & Systems - Service & Repair, Durham - Solar Power Systems
- Special Interest Schools Or Instruction, Durham
- Specialty Animal Services, Durham
- Specialty Stores, Durham
- Stoves & Furnace Equipment, Durham - Fittings & Repair Parts
- Structural Engineer, Durham
- Swimming Pools, Durham
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Durham
- Swimming Pools Supplies, Equipment & Accessories, Durham
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