- Salvage Yards, Wellsville - Auto, Motorcycle, Boat, Trucks, etc
- Satellite & Cable TV Equipment & Systems Repair & Service, Wellsville
- Satellite TV Service, Wellsville
- Scrap & Waste Materials, Wellsville
- Septic Tank Installation & Repair, Wellsville - Septic Systems
- Septic Tank Pumping & Cleaning, Wellsville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Wellsville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Wellsville - Drain Cleaner & Installation Services
- Shipping Terminals, Wellsville
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- Shopping & Shopping Services, Wellsville
- Siding Contractors, Wellsville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Social Services & Welfare, Wellsville
- Sororities, Wellsville
- Specialty Animal Services, Wellsville
- Specialty Stores, Wellsville
- Sporting Goods Stores, Wellsville
- Steel Manufacturers, Wellsville
- Swimming Pools Management Services, Wellsville
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