- Sales & Marketing Consultant, Walkersville
- Savings Banks, Walkersville
- Secondary Schools, Walkersville
- Security & Surveillance System & Equipment, Walkersville
- Security Services, Walkersville
- Sewer & Drain Cleaning & Repair, Walkersville - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Walkersville
- Skin Care & Cosmetology Salons, Walkersville
- Skin Care Products & Treatments, Walkersville
- Social Services & Welfare, Walkersville
- Societies & Foundation Associations, Walkersville
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- Special Events & Party Supply Rental, Walkersville
- Special Interest Schools Or Instruction, Walkersville
- Specialty Animal Services, Walkersville
- Specialty Stores, Walkersville
- Sporting Goods Equipment Rental, Walkersville
- Staffing & Support Services, Walkersville
- Surplus & Salvage Merchandise, Walkersville
- Swimming Pool, Sauna & Spa Contractors, Walkersville
- Swimming Pools Contractors, Walkersville - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Walkersville
- Swimming Pools Supplies, Equipment & Accessories, Walkersville
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