- Salvage Yards, Northwood - Auto, Motorcycle, Boat, Trucks, etc
- Sand Gravel & Aggregate, Northwood
- School Bus Transportation Service, Northwood
- Scientific Equipment & Services, Northwood
- Scientific Services, Northwood
- Scrap & Waste Materials, Northwood
- Seafood Restaurants, Northwood
- Security & Surveillance System & Equipment, Northwood
- Security Alarm Systems - Home & Business, Northwood
- Security Brokers & Dealers, Northwood
- Security Control Systems & Monitoring, Northwood - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Northwood
- Service & Gas Station Equipment & Services, Northwood
- Sewing & Yarn Stores & Supplies, Northwood
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- Shopping & Shopping Services, Northwood
- Signs, Northwood
- Skin Care & Cosmetology Salons, Northwood
- Skin Care Products & Treatments, Northwood
- Social Services & Welfare, Northwood
- Solar Energy Companies - Contractors, Northwood - Solar Panel Installation - Solar Power Systems
- Solar Equipment, Northwood
- Specialty Animal Services, Northwood
- Specialty Stores, Northwood
- Steak House Restaurants, Northwood
- Stoves & Furnace Equipment, Northwood - Fittings & Repair Parts
- Sunrooms & Solarium Construction Contractors, Northwood - Build & Repair
- Sunrooms, Greenhouses, Solariums & Atrium Builders, Northwood - Build & Repair
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