- Sandwich Shop Restaurants, Sylvania
- Satellite TV Service, Sylvania
- Savings Banks, Sylvania
- Sawmill & Planing Mills, Sylvania
- Sawmill Supplies & Equipment Repair, Sylvania
- School - Christian, Sylvania
- Scrap & Waste Materials, Sylvania
- Seafood Restaurants, Sylvania
- Secondary Schools, Sylvania
- Security Services, Sylvania
- Senior Citizens Service & Health Organizations, Sylvania
- Sewing & Yarn Stores & Supplies, Sylvania
- Shipping Service, Sylvania
- Shirts & T-Shirts, Sylvania
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- Shopping & Shopping Services, Sylvania
- Small Business & Office Equipment Repair Services, Sylvania
- Snack Foods, Sylvania
- Social Security Counselors & Representatives, Sylvania
- Social Services & Welfare, Sylvania
- Special Education & Care, Sylvania
- Specialty Stores, Sylvania
- Sporting Goods Stores, Sylvania
- Staffing & Support Services, Sylvania
- State Government, Sylvania
- State Highway Patrol, Sylvania
- State Law Enforcement, Sylvania
- Steak House Restaurants, Sylvania
- Surveyor Services, Sylvania - Surveying Service
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