- Satellite & Cable TV Equipment & Systems, Poolesville
- Satellite Dish Antennas & Equipment Dealers, Poolesville
- Savings Banks, Poolesville
- Security & Surveillance System & Equipment, Poolesville
- Security Services, Poolesville
- Senior Citizens Service & Health Organizations, Poolesville
- Service Contracts & Agreements, Poolesville
- Shopping & Shopping Services, Poolesville
- Snacks & Desserts, Poolesville
- Snow Removal Services, Poolesville - Snow Plow Service
- Social Services & Welfare, Poolesville
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- Societies & Foundation Associations, Poolesville
- Sod & Sodding Service, Poolesville
- Special Interest Schools Or Instruction, Poolesville
- Specialty Animal Services, Poolesville
- Specialty Stores, Poolesville
- Sporting & Recreational Camps, Poolesville
- Sporting Goods Stores, Poolesville
- Summer Camps, Poolesville
- Swimming Pool, Sauna & Spa Contractors, Poolesville
- Swimming Pools Contractors, Poolesville - Install Inground - Above Ground Pools
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