- Sand Gravel & Aggregate, Iron River
- Sandwich Shop Restaurants, Iron River
- Scrap & Waste Machinery, Iron River
- Scrap & Waste Materials, Iron River
- Security & Surveillance Products & Services, Iron River
- Security Services, Iron River
- Septic Tank Installation & Repair, Iron River - Septic Systems
- Septic Tank Pumping & Cleaning, Iron River - Septic Systems
- Septic Tanks & Septic Systems Contractors, Iron River - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Iron River - Wholesale, Dealers & Suppliers
- Shopping & Shopping Services, Iron River
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- Siding Contractors, Iron River - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Small Appliances, Iron River
- Snowmobile Repair, Parts, Sales & Service, Iron River
- Social Services & Welfare, Iron River
- Soil Testing Labs, Iron River - Concrete Testing
- Specialty Animal Services, Iron River
- Specialty Stores, Iron River
- Sporting Goods Stores, Iron River
- Stoves & Furnace Equipment, Iron River - Fittings & Repair Parts
- Supper Club Restaurants, Iron River
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