- Sand Gravel & Aggregate, Steelville
- Sandwich Shop Restaurants, Steelville
- Sawmill & Planing Mills, Steelville
- Sawmill Supplies & Equipment Repair, Steelville
- School - Christian, Steelville
- Screen Printing Supplies & Equipment, Steelville
- Secondary Schools, Steelville
- Secretarial & Court Reporting Services, Steelville
- Security Alarm Systems - Home & Business, Steelville
- Security Brokers & Dealers, Steelville
- Security Control Systems & Monitoring, Steelville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Steelville
- Senior Citizens Centers & Meals, Steelville
- Senior Citizens Service & Health Organizations, Steelville
- Septic Tank Installation & Repair, Steelville - Septic Systems
- Septic Tank Pumping & Cleaning, Steelville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Steelville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Steelville - Wholesale, Dealers & Suppliers
- Sewing Contractors, Steelville
- Sheet Metal Contractors, Steelville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Steelville
- Shopping & Shopping Services, Steelville
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- Siding Contractors, Steelville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Snacks & Desserts, Steelville
- Snow Removal Services, Steelville - Snow Plow Service
- Social Services & Welfare, Steelville
- Societies & Foundation Associations, Steelville
- Spare Rib Restaurants, Steelville
- Speciality Food Stores, Steelville
- Specialty Animal Services, Steelville
- Specialty Stores, Steelville
- Specialty Vehicle Rental & Leasing, Steelville
- Sporting Goods Equipment Rental, Steelville
- Sporting Goods Stores, Steelville
- State Government, Steelville
- State Law Enforcement, Steelville
- Steel & Metal Goods, Steelville - Steel Distributors
- Stone, Steelville
- Stoves & Furnace Equipment, Steelville - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Steelville
- Swimming Pool, Sauna & Spa Contractors, Steelville
- Swimming Pools Contractors, Steelville - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Steelville
- Swimming Pools Supplies, Equipment & Accessories, Steelville
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