- Safety & Security Systems & Consultants, Ridgefield
- Sales & Marketing Consultant, Ridgefield
- Sandwich Shop Restaurants, Ridgefield
- Satellite Communication Downlinking & Uplinking, Ridgefield
- Sawmill Equipment & Supplies, Ridgefield
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Ridgefield
- Scientific Services, Ridgefield
- Scrap & Waste Machinery, Ridgefield
- Scrap & Waste Materials, Ridgefield
- Screen Houses, Ridgefield
- Sculptures Retail, Ridgefield
- Seafood Restaurants, Ridgefield
- Sealants Retail, Ridgefield
- Secondary Schools, Ridgefield
- Security & Surveillance System & Equipment, Ridgefield
- Security Alarm Systems - Home & Business, Ridgefield
- Security Brokers & Dealers, Ridgefield
- Security Consultants, Ridgefield
- Security Control Systems & Monitoring, Ridgefield - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Ridgefield - Bodyguard, Guard Dogs, Etc
- Security Services, Ridgefield
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- Septic Tank Pumping & Cleaning, Ridgefield - Septic Systems
- Sheet Metal, Ridgefield
- Sheet Metal Contractors, Ridgefield - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Ridgefield
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, Ridgefield - Sheet Metal Products
- Shoe Stores, Ridgefield - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Ridgefield
- Social Services & Welfare, Ridgefield
- Societies & Foundation Associations, Ridgefield
- Solder Equipment & Service, Ridgefield
- Special Coatings, Ridgefield - Protective Coatings
- Special Interest Schools Or Instruction, Ridgefield
- Specialty Animal Services, Ridgefield
- Specialty Stores, Ridgefield
- Speech & Hearing Specialists, Ridgefield
- Speech Pathologists, Ridgefield - Speech & Language Therapy
- Sports & Recreational Services, Ridgefield
- State Government, Ridgefield
- Steel Manufacturers, Ridgefield
- Stocks & Bond Brokers, Ridgefield
- Surveyor Services, Ridgefield - Surveying Service
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