- Sand Gravel & Aggregate, Lyndonville
- Sandwich Shop Restaurants, Lyndonville
- Savings & Loan Associations, Lyndonville
- Savings Banks, Lyndonville
- Security Brokers & Dealers, Lyndonville
- Senior Citizens Service & Health Organizations, Lyndonville
- Septic Tank Pumping & Cleaning, Lyndonville - Septic Systems
- Septic Tanks & Systems, Lyndonville - Wholesale, Dealers & Suppliers
- Shopping & Shopping Services, Lyndonville
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- Snacks & Desserts, Lyndonville
- Snowmobile Dealers, Lyndonville - Parts, Gear, Clothing & Accessories
- Social Service Organizations Volunteer Services, Lyndonville
- Social Services & Welfare, Lyndonville
- Social Workers & Services, Lyndonville
- Specialty Stores, Lyndonville
- State Government, Lyndonville
- Stocks & Bond Brokers, Lyndonville
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