- Sandblasting, Uncasville - General Contractors
- Sandwich Shop Restaurants, Uncasville
- Scrap & Waste Materials, Uncasville
- Seafood Restaurants, Uncasville
- Sealants Retail, Uncasville
- Secondary Schools, Uncasville
- Security Alarm Systems - Home & Business, Uncasville
- Septic Tank Pumping & Cleaning, Uncasville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Uncasville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Service Establishment Supplies & Equipment, Uncasville
- Sewer & Drain Cleaning & Repair, Uncasville - Drain Cleaner & Installation Services
- Sheet Metal Contractors, Uncasville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Uncasville
- Shopping & Shopping Services, Uncasville
- Snacks & Desserts, Uncasville
- Social Services & Welfare, Uncasville
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- Solar Energy Companies - Contractors, Uncasville - Solar Panel Installation - Solar Power Systems
- Special Interest Schools Or Instruction, Uncasville
- Specialty Animal Services, Uncasville
- Specialty Communication Companies & Services, Uncasville
- Specialty Stores, Uncasville
- Sporting Goods Stores, Uncasville
- Sports Bars & Lounges, Uncasville
- Sprinkler Alarm Systems, Uncasville - Fire Sprinkler Systems
- Stamp Collecting & Coin Dealers , Uncasville
- State Government, Uncasville
- Steak House Restaurants, Uncasville
- Swimming Pool, Sauna & Spa Contractors, Uncasville
- Swimming Pools Contractors, Uncasville - Install Inground - Above Ground Pools
- Swimming Pools Management Services, Uncasville
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Uncasville
- Swimming Pools Supplies, Equipment & Accessories, Uncasville
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