- Sales & Marketing Consultant, Norwalk
- Sales Promotion Service, Norwalk
- Salvation Army, Norwalk
- Sandwich Shop Restaurants, Norwalk
- Satellite & Cable TV Equipment & Systems, Norwalk
- Satellite Dish Antennas & Equipment Dealers, Norwalk
- Satellite TV Service, Norwalk
- School - Christian, Norwalk
- Scrap & Waste Materials, Norwalk
- Scrapbooks & Scrapbook Supplies, Norwalk
- Screen Houses, Norwalk
- Screen Printing, Norwalk
- Secondary Schools, Norwalk
- Secretarial School, Norwalk
- Security & Surveillance System & Equipment, Norwalk
- Security Alarm Systems - Home & Business, Norwalk
- Security Brokers & Dealers, Norwalk
- Security Control Systems & Monitoring, Norwalk - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Norwalk
- Security Services, Norwalk
- Senior Citizens Service & Health Organizations, Norwalk
- Septic & Cesspool Equipment & Supplies, Norwalk
- Septic Tank Installation & Repair, Norwalk - Septic Systems
- Septic Tank Pumping & Cleaning, Norwalk - Septic Systems
- Septic Tanks & Septic Systems Contractors, Norwalk - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Norwalk - Drain Cleaner & Installation Services
- Sewer Cleaning Equipment & Supplies, Norwalk - Sewer Builders
- Sewer Construction Contractors, Norwalk - Sewer Line, Pipe Installation & Repair Services
- Sheet Metal, Norwalk
- Sheet Metal Contractors, Norwalk - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Norwalk
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, Norwalk - Sheet Metal Products
- Sheriff's Department, Norwalk
- Shoe Stores, Norwalk - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Norwalk
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- Siding Contractors, Norwalk - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Norwalk
- Silversmiths & Goldsmiths, Norwalk
- Silverware & Plated Ware, Norwalk
- Snacks & Desserts, Norwalk
- Snow Removal Services, Norwalk - Snow Plow Service
- Social Clubs & Organizations, Norwalk
- Social Services & Welfare, Norwalk
- Societies & Foundation Associations, Norwalk
- Sororities, Norwalk
- Special Education & Care, Norwalk
- Special Events & Party Supply Rental, Norwalk
- Special Interest Schools Or Instruction, Norwalk
- Speciality Food Stores, Norwalk
- Specialty Animal Services, Norwalk
- Specialty Stores, Norwalk
- Speech & Hearing Specialists, Norwalk
- Speech & Language Therapy, Norwalk
- Speech Pathologists, Norwalk - Speech & Language Therapy
- Sporting Goods Equipment Rental, Norwalk
- Sporting Goods Stores, Norwalk
- Sports & Recreational Services, Norwalk
- Sportswear Clothing Stores, Norwalk - Sports Clothes
- Staffing & Support Services, Norwalk
- State Government, Norwalk
- Stocks & Bond Brokers, Norwalk
- Storage - Household & Commercial-Full Service, Norwalk
- Stoves & Furnace Equipment, Norwalk - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Norwalk
- Surveying Engineer, Norwalk
- Surveyor Services, Norwalk - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Norwalk
- Swimming Pools Contractors, Norwalk - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Norwalk
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