- Sandwich Shop Restaurants, Mayville
- Satellite TV Service, Mayville
- Savings & Loan Associations, Mayville
- Savings Banks, Mayville
- Secondary Schools, Mayville
- Security Brokers & Dealers, Mayville
- Septic Tank Installation & Repair, Mayville - Septic Systems
- Septic Tank Pumping & Cleaning, Mayville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Mayville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Mayville - Wholesale, Dealers & Suppliers
- Sewer & Drain Cleaning & Repair, Mayville - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Mayville
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- Signs, Mayville
- Skin Care & Cosmetology Salons, Mayville
- Skin Care Products & Treatments, Mayville
- Social Services & Welfare, Mayville
- Societies & Foundation Associations, Mayville
- Special Dies Tools Jigs & Fixtures Manufacturers, Mayville
- Specialty Stores, Mayville
- Sports Medicine, Mayville - Doctors, Physicians & Surgeons
- Steel & Metal Goods, Mayville - Steel Distributors
- Steel Manufacturers, Mayville
- Stocks & Bond Brokers, Mayville
- Stone, Mayville
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