- Sandwich Shop Restaurants, Ellsworth
- Savings & Loan Associations, Ellsworth
- Savings Banks, Ellsworth
- Screen Printing, Ellsworth
- Secondary Schools, Ellsworth
- Senior Citizens Service & Health Organizations, Ellsworth
- Septic Tank Installation & Repair, Ellsworth - Septic Systems
- Septic Tank Pumping & Cleaning, Ellsworth - Septic Systems
- Septic Tanks & Septic Systems Contractors, Ellsworth - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems Contractors & Designers, Ellsworth
- Sewer & Drain Cleaning & Repair, Ellsworth - Drain Cleaner & Installation Services
- Sheet Metal Contractors, Ellsworth - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Ellsworth
- Sheriff's Department, Ellsworth
- Shirts & T-Shirts, Ellsworth
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- Shopping & Shopping Services, Ellsworth
- Siding Contractors, Ellsworth - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Snowmobile Repair, Parts, Sales & Service, Ellsworth
- Social Services & Welfare, Ellsworth
- Soil Testing Labs, Ellsworth - Concrete Testing
- Solar Products & Services, Ellsworth
- Specialty Animal Services, Ellsworth
- Specialty Stores, Ellsworth
- Sporting Goods Stores, Ellsworth
- State Government, Ellsworth
- Stone & Rock Quarry, Ellsworth - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Surgical & Medical Instruments Manufacturers, Ellsworth
- Surveyor Services, Ellsworth - Surveying Service
- Surveyors, Ellsworth
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