- Sales & Marketing Consultant, Boonsboro
- Sandblasting, Boonsboro - General Contractors
- Sandwich Shop Restaurants, Boonsboro
- Security & Surveillance System & Equipment, Boonsboro
- Security Brokers & Dealers, Boonsboro
- Security Investigative Services, Boonsboro
- Security Services, Boonsboro
- Septic Tanks & Systems, Boonsboro - Wholesale, Dealers & Suppliers
- Sheet Metal Contractors, Boonsboro - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Boonsboro
- Shopping & Shopping Services, Boonsboro
- Siding Contractors, Boonsboro - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Small Appliances, Boonsboro
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- Snacks & Desserts, Boonsboro
- Snow Removal Services, Boonsboro - Snow Plow Service
- Social Services & Welfare, Boonsboro
- Societies & Foundation Associations, Boonsboro
- Specialty Stores, Boonsboro
- Sporting Goods Stores, Boonsboro
- Sprinkler System Contractors, Boonsboro - Garden & Lawn Sprinkler System Installation & Repair
- Stamp Collecting & Coin Dealers , Boonsboro
- State Government, Boonsboro
- Stucco Siding Contractors, Boonsboro - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Boonsboro
- Swimming Pools Management Services, Boonsboro
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