- Sandwich Shop Restaurants, Madelia
- School - Catholic, Madelia
- School - Christian, Madelia
- Security Brokers & Dealers, Madelia
- Seeds & Bulbs Wholesale & Growers, Madelia
- Septic Tank Installation & Repair, Madelia - Septic Systems
- Septic Tank Pumping & Cleaning, Madelia - Septic Systems
- Septic Tanks & Septic Systems Contractors, Madelia - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Shopping & Shopping Services, Madelia
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- Siding Contractors, Madelia - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Snowmobile Dealers, Madelia - Parts, Gear, Clothing & Accessories
- Snowmobile Repair, Parts, Sales & Service, Madelia
- Social Services & Welfare, Madelia
- Specialty Animal Services, Madelia
- Specialty Stores, Madelia
- Stoves & Furnace Equipment, Madelia - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Madelia
- Swimming, Madelia
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