- Sandwich Shop Restaurants, Jefferson
- Screen Printing, Jefferson
- Secondary Schools, Jefferson
- Security Alarm Systems - Home & Business, Jefferson
- Security Brokers & Dealers, Jefferson
- Security Control Systems & Monitoring, Jefferson - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Jefferson
- Septic Tank Installation & Repair, Jefferson - Septic Systems
- Septic Tank Pumping & Cleaning, Jefferson - Septic Systems
- Septic Tanks & Septic Systems Contractors, Jefferson - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Jefferson - Wholesale, Dealers & Suppliers
- Service Establishment Supplies & Equipment, Jefferson
- Shopping & Shopping Services, Jefferson
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- Siding Contractors, Jefferson - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Snowmobile Dealers, Jefferson - Parts, Gear, Clothing & Accessories
- Social Services & Welfare, Jefferson
- Special Dies Tools Jigs & Fixtures Manufacturers, Jefferson
- Specialty Stores, Jefferson
- Sporting Goods Equipment Rental, Jefferson
- Sprinkler Alarm Systems, Jefferson - Fire Sprinkler Systems
- Staffing & Support Services, Jefferson
- State Government, Jefferson
- Steel Manufacturers, Jefferson
- Surveyor Services, Jefferson - Surveying Service
- Swimming Pools Supplies, Equipment & Accessories, Jefferson
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