- Sand Gravel & Aggregate, North Windham
- Sandwich Shop Restaurants, North Windham
- Satellite TV Service, North Windham
- Septic Tank Pumping & Cleaning, North Windham - Septic Systems
- Septic Tanks & Septic Systems Contractors, North Windham - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, North Windham - Drain Cleaner & Installation Services
- Sewer Construction Contractors, North Windham - Sewer Line, Pipe Installation & Repair Services
- Sheet Metal, North Windham
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, North Windham - Sheet Metal Products
- Shopping & Shopping Services, North Windham
- Social Services & Welfare, North Windham
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- Social Workers & Services, North Windham
- Special Interest Schools Or Instruction, North Windham
- Specialty Stores, North Windham
- Sporting Goods Stores, North Windham
- Stairs & Railings Contractors, North Windham - Metal & Wood Stairs, Spiral Staircase & Stair Railing - Installation & Repair
- Stairs, Balcony, Terrace & Steeple Contractors, North Windham
- Stoves & Furnace Equipment, North Windham - Fittings & Repair Parts
- Substance Abuse Clinics, North Windham - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Swimming Pools Management Services, North Windham
- Swimming Pools Supplies, Equipment & Accessories, North Windham
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