- Safety & Security Systems & Consultants, West Haven
- Sand Gravel & Aggregate, West Haven
- Sandwich Shop Restaurants, West Haven
- Savings Banks, West Haven
- School - Catholic, West Haven
- School - Christian, West Haven
- Scientific Equipment & Services, West Haven
- Scientific Services, West Haven
- Scrap & Waste Materials, West Haven
- Screen Printing, West Haven
- Seafood Restaurants, West Haven
- Sealants Retail, West Haven
- Sealcoating, West Haven - Asphalt Sealcoating & Paving
- Secondary Schools, West Haven
- Secretarial School, West Haven
- Security & Surveillance System & Equipment, West Haven
- Security Alarm Systems - Home & Business, West Haven
- Security Brokers & Dealers, West Haven
- Security Consultants, West Haven
- Security Control Systems & Monitoring, West Haven - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, West Haven
- Septic Tank Installation & Repair, West Haven - Septic Systems
- Septic Tank Pumping & Cleaning, West Haven - Septic Systems
- Septic Tanks & Septic Systems Contractors, West Haven - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Service Station Equipment - Installation, Repair & Maintenance, West Haven
- Sewer & Drain Cleaning & Repair, West Haven - Drain Cleaner & Installation Services
- Sewer Construction Contractors, West Haven - Sewer Line, Pipe Installation & Repair Services
- Sheet Metal Contractors, West Haven - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, West Haven
- Ship & Boat Building & Repairing, West Haven
- Shoe Store - More, West Haven
- Shoe Stores, West Haven - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, West Haven
- Siding Contractors, West Haven - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
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- Siding Materials, West Haven
- Sign Lettering & Painting Services, West Haven
- Signs, West Haven
- Skin Care & Cosmetology Salons, West Haven
- Sleep Disorders Treatment & Information Centers, West Haven
- Snacks & Desserts, West Haven
- Snow Removal Services, West Haven - Snow Plow Service
- Snowplows, West Haven
- Social Clubs & Organizations, West Haven
- Social Services & Welfare, West Haven
- Societies & Foundation Associations, West Haven
- Soil Preparation Services, West Haven
- Soil Services, West Haven
- Solar Energy Companies - Contractors, West Haven - Solar Panel Installation - Solar Power Systems
- South American Restaurants, West Haven
- Special Coatings, West Haven - Protective Coatings
- Special Interest Schools Or Instruction, West Haven
- Specialty Animal Services, West Haven
- Specialty Stores, West Haven
- Specialty Wall Finishes, West Haven
- Sporting Goods Equipment Rental, West Haven
- Sporting Goods Stores, West Haven
- Sports Bars & Lounges, West Haven
- Sports Medicine, West Haven - Doctors, Physicians & Surgeons
- Staffing & Support Services, West Haven
- State Government, West Haven
- Steak House Restaurants, West Haven
- Steamship Companies & Agencies, West Haven
- Steel & Metal Goods, West Haven - Steel Distributors
- Stock & Bond Brokers & Dealers, West Haven
- Stocks & Bond Brokers, West Haven
- Structural Engineer, West Haven
- Substance Abuse Services, West Haven
- Sushi Restaurants, West Haven
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