- Sawmill & Planing Mills, Powassan
- Sawmill Supplies & Equipment Repair, Powassan
- Secondary Schools, Powassan
- Senior Citizens Housing, Powassan
- Septic Systems Installation & Repair, Powassan
- Septic Tanks & Septic Systems Contractors, Powassan - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sheet Metal Contractors, Powassan - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Powassan
- Shopping & Shopping Services, Powassan
- Signs, Powassan
- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, Powassan
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- Snowmobile Centers & Resorts, Powassan
- Snowmobile Dealers, Powassan - Parts, Gear, Clothing & Accessories
- Social Services & Welfare, Powassan
- Specialty Animal Services, Powassan
- Specialty Stores, Powassan
- Sporting Goods Stores, Powassan
- Stadiums, Arenas, Coliseums & Athletic Fields, Powassan
- State Government, Powassan
- Stoves & Furnace Equipment, Powassan - Fittings & Repair Parts
- Stress Management & Counseling, Powassan
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