- Sales & Marketing Consultant, Potomac
- Sandwich Shop Restaurants, Potomac
- Satellite Communication Downlinking & Uplinking, Potomac
- Satellite Technology & Space Research, Potomac
- Savings Banks, Potomac
- School - Jewish, Potomac
- Scientific Services, Potomac
- Seafood Restaurants, Potomac
- Secondary Schools, Potomac
- Secretarial & Court Reporting Services, Potomac
- Security & Surveillance System & Equipment, Potomac
- Security Alarm Systems - Home & Business, Potomac
- Security Brokers & Dealers, Potomac
- Security Control Systems & Monitoring, Potomac - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Potomac
- Senior Citizens Housing, Potomac
- Senior Citizens Service & Health Organizations, Potomac
- Sewer & Drain Cleaning & Repair, Potomac - Drain Cleaner & Installation Services
- Shoe Dyers, Potomac
- Shoe Repair Shops, Potomac
- Shoe Stores, Potomac - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Potomac
- Skin Care & Cosmetology Salons, Potomac
- Skin Care Products & Treatments, Potomac
- Sleep Doctors, Potomac - Specialists, Physicians & Surgeons (Sleep Medicine)
- Small Appliances, Potomac
- Snow Removal Services, Potomac - Snow Plow Service
- Social Services & Welfare, Potomac
- Social Workers & Services, Potomac
- Societies & Foundation Associations, Potomac
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- Special Education & Care, Potomac
- Special Interest Schools Or Instruction, Potomac
- Specialty Animal Services, Potomac
- Specialty Stores, Potomac
- Speech & Hearing Specialists, Potomac
- Sporting & Recreational Camps, Potomac
- Sporting Goods Stores, Potomac
- Sports & Recreational Services, Potomac
- Squash Courts, Potomac
- Staffing & Support Services, Potomac
- Stamp Collecting & Coin Dealers , Potomac
- State Government, Potomac
- Stock & Bond Brokers & Dealers, Potomac
- Stocks & Bond Brokers, Potomac
- Stone Setting Contractors, Potomac
- Structural Engineer, Potomac
- Submarine Sandwich Restaurants, Potomac
- Substance Abuse Clinics, Potomac - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Summer Camps, Potomac
- Sunrooms & Solarium Construction Contractors, Potomac - Build & Repair
- Sunrooms, Greenhouses, Solariums & Atrium Builders, Potomac - Build & Repair
- Sushi Restaurants, Potomac
- Swimming Pool Covers & Enclosures, Potomac
- Swimming Pool, Sauna & Spa Contractors, Potomac
- Swimming Pools, Potomac
- Swimming Pools Contractors, Potomac - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Potomac
- Swimming Pools Supplies, Equipment & Accessories, Potomac
- Synagogues & Temples, Potomac
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