- Safety Equipment & Supplies, Mount Vernon
- Sand Gravel & Aggregate, Mount Vernon
- Sandwich Shop Restaurants, Mount Vernon
- Satellite & Cable TV Equipment & Systems Repair & Service, Mount Vernon
- Satellite Communication Downlinking & Uplinking, Mount Vernon
- Satellite Dish Antennas & Equipment Dealers, Mount Vernon
- Satellite TV Service, Mount Vernon
- Secondary Schools, Mount Vernon
- Security Brokers & Dealers, Mount Vernon
- Senior Citizens Service & Health Organizations, Mount Vernon
- Septic Tank Installation & Repair, Mount Vernon - Septic Systems
- Septic Tank Pumping & Cleaning, Mount Vernon - Septic Systems
- Septic Tanks & Septic Systems Contractors, Mount Vernon - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Mount Vernon - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Mount Vernon - Sewer Line, Pipe Installation & Repair Services
- Shopping & Shopping Services, Mount Vernon
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- Snacks & Desserts, Mount Vernon
- Social Services & Welfare, Mount Vernon
- Societies & Foundation Associations, Mount Vernon
- Special Dies Tools Jigs & Fixtures Manufacturers, Mount Vernon
- Specialty Animal Services, Mount Vernon
- Specialty Stores, Mount Vernon
- Sporting Goods Stores, Mount Vernon
- Sports Bars & Lounges, Mount Vernon
- Staffing & Support Services, Mount Vernon
- State Government, Mount Vernon
- Steel Manufacturers, Mount Vernon
- Stocks & Bond Brokers, Mount Vernon
- Stone, Mount Vernon
- Submarine Sandwich Restaurants, Mount Vernon
- Support Services, Mount Vernon
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