- Sandwich Shop Restaurants, Thurmont
- Satellite & Cable TV Equipment & Systems, Thurmont
- Satellite Dish Antennas & Equipment Dealers, Thurmont
- Seafood Restaurants, Thurmont
- Sealcoating, Thurmont - Asphalt Sealcoating & Paving
- Secondary Schools, Thurmont
- Security & Surveillance System & Equipment, Thurmont
- Security Alarm Systems - Home & Business, Thurmont
- Security Control Systems & Monitoring, Thurmont - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Thurmont
- Senior Citizens Service & Health Organizations, Thurmont
- Septic Tank Installation & Repair, Thurmont - Septic Systems
- Septic Tank Pumping & Cleaning, Thurmont - Septic Systems
- Septic Tanks & Septic Systems Contractors, Thurmont - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Shopping & Shopping Services, Thurmont
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- Signs, Thurmont
- Snacks & Desserts, Thurmont
- Snow Removal Services, Thurmont - Snow Plow Service
- Social Services & Welfare, Thurmont
- Societies & Foundation Associations, Thurmont
- Sound Systems & Recording Equipment, Thurmont
- Special Interest Schools Or Instruction, Thurmont
- Specialty Animal Services, Thurmont
- Specialty Stores, Thurmont
- Sporting Goods Stores, Thurmont
- Staffing & Support Services, Thurmont
- State Government, Thurmont
- Steel Erection Contractors, Thurmont - Steel Erectors
- Storage & Closet Equipment Supplies & Materials, Thurmont
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Thurmont
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