- Safety & Security Systems & Consultants, Wallingford
- Sales & Marketing Consultant, Wallingford
- Sandblasting Equipment & Supplies, Wallingford
- Sandwich Shop Restaurants, Wallingford
- Satellite Descrambling & Programming Service, Wallingford
- Satellite Dish Antennas & Equipment Dealers, Wallingford
- Satellite TV Service, Wallingford
- Savings & Loan Associations, Wallingford
- Savings Banks, Wallingford
- Sawmill & Planing Mills, Wallingford
- Sawmill Supplies & Equipment Repair, Wallingford
- Scrap & Waste Materials, Wallingford
- Screen Houses, Wallingford
- Screen Printing, Wallingford
- Seafood Restaurants, Wallingford
- Sealcoating, Wallingford - Asphalt Sealcoating & Paving
- Secondary Schools, Wallingford
- Secretarial & Court Reporting Services, Wallingford
- Security & Surveillance System & Equipment, Wallingford
- Security Alarm Systems - Home & Business, Wallingford
- Security Brokers & Dealers, Wallingford
- Security Consultants, Wallingford
- Security Control Systems & Monitoring, Wallingford - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Wallingford
- Security Services, Wallingford
- Self Defense Programs, Wallingford
- Semiconductors & Equipment, Wallingford
- Senior Citizens Service & Health Organizations, Wallingford
- Septic Tank Installation & Repair, Wallingford - Septic Systems
- Septic Tank Pumping & Cleaning, Wallingford - Septic Systems
- Septic Tanks & Septic Systems Contractors, Wallingford - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Wallingford - Drain Cleaner & Installation Services
- Sewer Companies, Wallingford
- Sewing & Yarn Stores & Supplies, Wallingford
- Sheet Metal Contractors, Wallingford - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Wallingford
- Sheriff's Department, Wallingford
- Shirts & T-Shirts, Wallingford
- Shoe Stores, Wallingford - Mens, Womens & Kids Shoes
- Shooting & Target Ranges, Wallingford
- Shopping & Shopping Services, Wallingford
- Siding Contractors, Wallingford - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Sign Hanging & Installation Service, Wallingford - Signs Erectors & Hangers
- Signs, Wallingford
- Silversmiths & Goldsmiths, Wallingford
- Silverware & Plated Ware, Wallingford
- Skin Care & Cosmetology Salons, Wallingford
- Skin Care Products & Treatments, Wallingford
- Small Appliances, Wallingford
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- Smoke Stacks Manufacturers, Wallingford
- Snacks & Desserts, Wallingford
- Snow Removal Services, Wallingford - Snow Plow Service
- Snowmobile Dealers, Wallingford - Parts, Gear, Clothing & Accessories
- Social Clubs & Organizations, Wallingford
- Social Services & Welfare, Wallingford
- Social Workers & Services, Wallingford
- Societies & Foundation Associations, Wallingford
- Special Education & Care, Wallingford
- Special Events & Party Supply Rental, Wallingford
- Special Events Photographers, Wallingford
- Special Interest Schools Or Instruction, Wallingford
- Specialty Animal Services, Wallingford
- Specialty Communication Companies & Services, Wallingford
- Specialty Stores, Wallingford
- Speech & Hearing Specialists, Wallingford
- Sporting Goods Equipment Rental, Wallingford
- Sporting Goods Stores, Wallingford
- Sports Bars & Lounges, Wallingford
- Sports Clubs, Wallingford
- Sports Information Services, Wallingford
- Sports Medicine, Wallingford - Doctors, Physicians & Surgeons
- Sportswear Clothing Stores, Wallingford - Sports Clothes
- Spray Painting & Finishing, Wallingford - Plastic, Furniture, Acrylic, Wood & Metal
- Spraying Booths & Equipment, Wallingford
- Sprinkler System Contractors, Wallingford - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Wallingford
- State Government, Wallingford
- Stationery & Office Supplies, Wallingford
- Steel & Metal Goods, Wallingford - Steel Distributors
- Steel Manufacturers, Wallingford
- Steel Mills & Blast Furnaces, Wallingford
- Steel Tool & Alloy, Wallingford
- Stock & Bond Brokers & Dealers, Wallingford
- Stocks & Bond Brokers, Wallingford
- Store Fronts, Wallingford - Storefront
- Stove, Oven, Range & Cooktop Parts & Supplies, Wallingford
- Stoves & Furnace Equipment, Wallingford - Fittings & Repair Parts
- Structural Engineer, Wallingford
- Submarine Sandwich Restaurants, Wallingford
- Substance Abuse Services, Wallingford
- Surplus & Salvage Merchandise, Wallingford
- Surveyor Services, Wallingford - Surveying Service
- Sushi Restaurants, Wallingford
- Swimming Pool Designing & Consulting, Wallingford
- Swimming Pool, Sauna & Spa Contractors, Wallingford
- Swimming Pools Contractors, Wallingford - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Wallingford
- Swimming Pools Supplies, Equipment & Accessories, Wallingford
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