- Sand Gravel & Aggregate, Ortonville
- Sandwich Shop Restaurants, Ortonville
- Satellite TV Service, Ortonville
- Sealants Retail, Ortonville
- Secondary Schools, Ortonville
- Security Brokers & Dealers, Ortonville
- Septic Tank Installation & Repair, Ortonville - Septic Systems
- Septic Tank Pumping & Cleaning, Ortonville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Ortonville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Ortonville - Wholesale, Dealers & Suppliers
- Sewing & Yarn Stores & Supplies, Ortonville
- Shopping & Shopping Services, Ortonville
- Siding Contractors, Ortonville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
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- Signs, Ortonville
- Social Services & Welfare, Ortonville
- Special Events & Party Supply Rental, Ortonville
- Special Interest Schools Or Instruction, Ortonville
- Specialty Animal Services, Ortonville
- Specialty Stores, Ortonville
- Sporting Goods Stores, Ortonville
- State Government, Ortonville
- Stocks & Bond Brokers, Ortonville
- Stoves & Furnace Equipment, Ortonville - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Ortonville
- Swimming Pool, Sauna & Spa Contractors, Ortonville
- Swimming Pools Contractors, Ortonville - Install Inground - Above Ground Pools
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