- Sand Gravel & Aggregate, South Dennis
- Sandwich Shop Restaurants, South Dennis
- Savings & Loan Associations, South Dennis
- Savings Banks, South Dennis
- Sealcoating, South Dennis - Asphalt Sealcoating & Paving
- Secondary Schools, South Dennis
- Security Brokers & Dealers, South Dennis
- Senior Citizens Service & Health Organizations, South Dennis
- Septic Tank Installation & Repair, South Dennis - Septic Systems
- Septic Tank Pumping & Cleaning, South Dennis - Septic Systems
- Septic Tanks & Septic Systems Contractors, South Dennis - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, South Dennis - Wholesale, Dealers & Suppliers
- Septic Tanks & Systems Inspection, South Dennis
- Sewer & Drain Cleaning & Repair, South Dennis - Drain Cleaner & Installation Services
- Shopping & Shopping Services, South Dennis
- Silversmiths & Goldsmiths, South Dennis
- Silverware & Plated Ware, South Dennis
- Skating Rink & Hockey Operation Services, South Dennis
- Snacks & Desserts, South Dennis
- Snow Removal Services, South Dennis - Snow Plow Service
- Social Services & Welfare, South Dennis
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- Societies & Foundation Associations, South Dennis
- Solar Energy Companies - Contractors, South Dennis - Solar Panel Installation - Solar Power Systems
- Solar Energy Equipment & Systems - Service & Repair, South Dennis - Solar Power Systems
- Special Interest Schools Or Instruction, South Dennis
- Specialty Stores, South Dennis
- Speech & Hearing Specialists, South Dennis
- Sporting Goods Equipment Rental, South Dennis
- Sporting Goods Stores, South Dennis
- Sports & Recreational Services, South Dennis
- Sprinkler System Contractors, South Dennis - Garden & Lawn Sprinkler System Installation & Repair
- Stock & Bond Brokers & Dealers, South Dennis
- Stocks & Bond Brokers, South Dennis
- Storage Containers, South Dennis
- Stove, Oven, Range & Cooktop Parts & Supplies, South Dennis
- Surfboard & Windsurfing Equipment Shops, South Dennis
- Surveyor Services, South Dennis - Surveying Service
- Swimming Pool Covers & Enclosures, South Dennis
- Swimming Pool, Sauna & Spa Contractors, South Dennis
- Swimming Pools Contractors, South Dennis - Install Inground - Above Ground Pools
- Swimming Pools Supplies, Equipment & Accessories, South Dennis
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