- Safety & Security Systems & Consultants, Seymour
- Sandwich Shop Restaurants, Seymour
- Secondary Schools, Seymour
- Security & Commodity Brokers, Seymour
- Security & Surveillance System & Equipment, Seymour
- Security Brokers & Dealers, Seymour
- Security Services, Seymour
- Senior Citizens Centers & Meals, Seymour
- Shirts & T-Shirts, Seymour
- Shoe Repair Shops, Seymour
- Shopping & Shopping Services, Seymour
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- Snacks & Desserts, Seymour
- Social Services & Welfare, Seymour
- Specialty Animal Services, Seymour
- Specialty Stores, Seymour
- Sporting Goods Stores, Seymour
- Stamp Collecting & Coin Dealers , Seymour
- State Government, Seymour
- Steak House Restaurants, Seymour
- Steel & Metal Goods, Seymour - Steel Distributors
- Stocks & Bond Brokers, Seymour
- Surveyor Services, Seymour - Surveying Service
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