- Sandwich Shop Restaurants, East Haven
- Savings Banks, East Haven
- Scaffolding & Aerial Lifts, East Haven
- School - Catholic, East Haven
- School - Christian, East Haven
- Scientific Equipment & Services, East Haven
- Scientific Services, East Haven
- Screen Printing, East Haven
- Seafood Restaurants, East Haven
- Security & Surveillance System & Equipment, East Haven
- Security Brokers & Dealers, East Haven
- Security Investigative Services, East Haven
- Security Services, East Haven
- Senior Citizens Housing, East Haven
- Sewer & Drain Cleaning & Repair, East Haven - Drain Cleaner & Installation Services
- Sewer Construction Contractors, East Haven - Sewer Line, Pipe Installation & Repair Services
- Sheet Metal Contractors, East Haven - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, East Haven
- Shoe Stores, East Haven - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, East Haven
- Siding Contractors, East Haven - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, East Haven
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- Skating Supplies, East Haven - Ice, Inline, Speed, Figure & Roller Skates
- Skin Care & Cosmetology Salons, East Haven
- Snacks & Desserts, East Haven
- Social Clubs & Organizations, East Haven
- Social Security And Disability Attorneys & Lawyers, East Haven
- Social Security And Disability Lawyers & Attorneys, East Haven
- Social Services & Welfare, East Haven
- Societies & Foundation Associations, East Haven
- South American Restaurants, East Haven
- Spare Rib Restaurants, East Haven
- Special Interest Schools Or Instruction, East Haven
- Specialty Animal Services, East Haven
- Specialty Stores, East Haven
- Sporting Goods Stores, East Haven
- Sports Clubs, East Haven
- Sportswear Clothing Stores, East Haven - Sports Clothes
- Staffing & Support Services, East Haven
- State Government, East Haven
- Steak House Restaurants, East Haven
- Steel & Metal Goods, East Haven - Steel Distributors
- Stoves & Furnace Equipment, East Haven - Fittings & Repair Parts
- Swimming Pools Repair, Service, Supplies, Sale & Installation, East Haven
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