- Safety Equipment & Supplies, Northwood
- Sandwich Shop Restaurants, Northwood
- Satellite Dish Antennas & Equipment Dealers, Northwood
- Science & Research, Northwood
- Secondary Schools, Northwood
- Security Investigative Services, Northwood
- Security Services, Northwood
- Service & Gas Station Equipment & Services, Northwood
- Sewer & Drain Cleaning & Repair, Northwood - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Northwood - Sewer Line, Pipe Installation & Repair Services
- Shoe Stores, Northwood - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Northwood
- Social Services & Welfare, Northwood
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- Societies & Foundation Associations, Northwood
- Special Dies Tools Jigs & Fixtures Manufacturers, Northwood
- Special Events & Party Supply Rental, Northwood
- Specialty Animal Services, Northwood
- Specialty Stores, Northwood
- Sporting Goods Stores, Northwood
- Staffing & Support Services, Northwood
- State Government, Northwood
- Swimming Pool Designing & Consulting, Northwood
- Swimming Pool, Sauna & Spa Contractors, Northwood
- Swimming Pools Contractors, Northwood - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Northwood
- Swimming Pools Supplies, Equipment & Accessories, Northwood
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