- Safety & Security Systems & Consultants, New Haven
- Sandwich Shop Restaurants, New Haven
- Satellite Dish Antennas & Equipment Dealers, New Haven
- Satellite TV Service, New Haven
- Seafood Restaurants, New Haven
- Secondary Schools, New Haven
- Security Brokers & Dealers, New Haven
- Security Services, New Haven
- Shopping & Shopping Services, New Haven
- Social Services & Welfare, New Haven
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- Soil Testing Labs, New Haven - Concrete Testing
- Special Dies Tools Jigs & Fixtures Manufacturers, New Haven
- Specialty Animal Services, New Haven
- Specialty Goods Storage, New Haven
- Specialty Stores, New Haven
- Sporting Goods Stores, New Haven
- Stocks & Bond Brokers, New Haven
- Stone And Glass Products, New Haven
- Stoves & Furnace Equipment, New Haven - Fittings & Repair Parts
- Submarine Sandwich Restaurants, New Haven
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