- Sand Gravel & Aggregate, Windham
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Windham
- Scaffolding & Aerial Lifts, Windham
- Scientific & Laboratory Equipment & Instruments, Windham
- Scrap & Waste Materials, Windham
- Security & Surveillance System & Equipment, Windham
- Security Alarm Systems - Home & Business, Windham
- Security Brokers & Dealers, Windham
- Security Control Systems & Monitoring, Windham - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Windham - Bodyguard, Guard Dogs, Etc
- Security Services, Windham
- Semiconductors & Equipment, Windham
- Senior Citizens Service & Health Organizations, Windham
- Septic Tanks & Systems, Windham - Wholesale, Dealers & Suppliers
- Sewing & Yarn Stores & Supplies, Windham
- Sheet Metal Contractors, Windham - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Windham
- Shoe Stores, Windham - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Windham
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- Siding Contractors, Windham - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Windham
- Small Business & Office Equipment Repair Services, Windham
- Snow Removal Services, Windham - Snow Plow Service
- Social Services & Welfare, Windham
- Societies & Foundation Associations, Windham
- Special Events & Party Supply Rental, Windham
- Special Interest Schools Or Instruction, Windham
- Speciality Food Stores, Windham
- Specialty Animal Services, Windham
- Specialty Stores, Windham
- Sporting Goods Equipment Rental, Windham
- Sporting Goods Stores, Windham
- Sports & Recreational Services, Windham
- Staffing & Support Services, Windham
- Stocks & Bond Brokers, Windham
- Surveyor Services, Windham - Surveying Service
- Survival Equipment & Supplies, Windham
- Sushi Restaurants, Windham
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