- Sand Gravel & Aggregate, Northwood
- Sandwich Shop Restaurants, Northwood
- Sawmill & Planing Mills, Northwood
- Sawmill Supplies & Equipment Repair, Northwood
- Scrap & Waste Materials, Northwood
- Secondary Schools, Northwood
- Security Brokers & Dealers, Northwood
- Senior Citizens Service & Health Organizations, Northwood
- Shopping & Shopping Services, Northwood
- Siding Contractors, Northwood - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
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- Social Services & Welfare, Northwood
- Specialty Animal Services, Northwood
- Specialty Stores, Northwood
- Sports Medicine, Northwood - Doctors, Physicians & Surgeons
- Stock & Bond Brokers & Dealers, Northwood
- Stocks & Bond Brokers, Northwood
- Stone & Rock Quarry, Northwood - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Submarine Sandwich Restaurants, Northwood
- Supper Club Restaurants, Northwood
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