- Sandwich Shop Restaurants, Windsor
- Savings Banks, Windsor
- Seafood Restaurants, Windsor
- Secondary Schools, Windsor
- Security Brokers & Dealers, Windsor
- Senior Citizens Housing, Windsor
- Septic Tank Pumping & Cleaning, Windsor - Septic Systems
- Septic Tanks & Septic Systems Contractors, Windsor - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Shopping & Shopping Services, Windsor
- Small Appliances, Windsor
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- Snack Foods, Windsor
- Snacks & Desserts, Windsor
- Social Service Organizations Volunteer Services, Windsor
- Social Services & Welfare, Windsor
- Societies & Foundation Associations, Windsor
- Specialty Stores, Windsor
- State Government, Windsor
- Stocks & Bond Brokers, Windsor
- Substance Abuse Clinics, Windsor - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Windsor - Surveying Service
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