- Sales & Marketing Consultant, Ellington
- Sandwich Shop Restaurants, Ellington
- Science & Medical Equipment, Ellington
- Science & Research, Ellington
- Scientific Equipment & Services, Ellington
- Scientific Services, Ellington
- Scrap & Waste Machinery, Ellington
- Scrap & Waste Materials, Ellington
- Screens Doors & Windows, Ellington
- Sealants Retail, Ellington
- Seals, Ellington - Hermetic, Hydraulic, Mechanical, Metal, Oil, Grease, etc
- Seals O Ring, Ellington
- Security Brokers & Dealers, Ellington
- Septic Tank Installation & Repair, Ellington - Septic Systems
- Septic Tank Pumping & Cleaning, Ellington - Septic Systems
- Septic Tanks & Septic Systems Contractors, Ellington - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Ellington - Drain Cleaner & Installation Services
- Sharpening Service, Ellington
- Sheet Metal Contractors, Ellington - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Ellington
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- Shopping & Shopping Services, Ellington
- Siding Contractors, Ellington - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Ellington
- Snow Removal Services, Ellington - Snow Plow Service
- Social Services & Welfare, Ellington
- Social Workers & Services, Ellington
- Special Events & Party Supply Rental, Ellington
- Special Interest Schools Or Instruction, Ellington
- Specialty Animal Services, Ellington
- Specialty Stores, Ellington
- Sporting Goods Stores, Ellington
- Sports & Recreational Services, Ellington
- Staffing & Support Services, Ellington
- Staircases Stairs & Railings, Ellington
- Surveyor Services, Ellington - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Ellington
- Swimming Pools Contractors, Ellington - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Ellington
- Swimming Pools Supplies, Equipment & Accessories, Ellington
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