- Sand Gravel & Aggregate, Mattituck
- Satellite Dish Antennas & Equipment Dealers, Mattituck
- Seafood Restaurants, Mattituck
- Security & Surveillance System & Equipment, Mattituck
- Security Services, Mattituck
- Senior Citizens Information & Services, Mattituck
- Septic Tank Installation & Repair, Mattituck - Septic Systems
- Septic Tank Pumping & Cleaning, Mattituck - Septic Systems
- Septic Tanks & Septic Systems Contractors, Mattituck - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Mattituck - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Mattituck
- Shopping & Shopping Services, Mattituck
- Snacks & Desserts, Mattituck
- Snow Removal Services, Mattituck - Snow Plow Service
- Social Services & Welfare, Mattituck
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- Societies & Foundation Associations, Mattituck
- Sod & Sodding Service, Mattituck
- Solar Energy Companies - Contractors, Mattituck - Solar Panel Installation - Solar Power Systems
- Solar Energy Equipment & Systems - Service & Repair, Mattituck - Solar Power Systems
- Special Events & Party Supply Rental, Mattituck
- Special Interest Schools Or Instruction, Mattituck
- Specialty Animal Services, Mattituck
- Specialty Stores, Mattituck
- Sporting Goods Stores, Mattituck
- Stairs & Railings Contractors, Mattituck - Metal & Wood Stairs, Spiral Staircase & Stair Railing - Installation & Repair
- Stairs, Balcony, Terrace & Steeple Contractors, Mattituck
- Swimming Pool Covers & Enclosures, Mattituck
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Mattituck
- Swimming Pools Supplies, Equipment & Accessories, Mattituck
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