- Sand Gravel & Aggregate, Quincy
- Sandblasting, Quincy - General Contractors
- Screen Printing, Quincy
- Secondary Schools, Quincy
- Semi-Precious Stones, Quincy
- Septic Tank Installation & Repair, Quincy - Septic Systems
- Septic Tank Pumping & Cleaning, Quincy - Septic Systems
- Septic Tanks & Septic Systems Contractors, Quincy - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Quincy - Drain Cleaner & Installation Services
- Sewing Contractors, Quincy
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- Shopping & Shopping Services, Quincy
- Snacks & Desserts, Quincy
- Snow Removal Services, Quincy - Snow Plow Service
- Social Services & Welfare, Quincy
- Special Dies Tools Jigs & Fixtures Manufacturers, Quincy
- Specialty Stores, Quincy
- Sporting Goods Stores, Quincy
- Steel Manufacturers, Quincy
- Stone, Quincy
- Surveyor Services, Quincy - Surveying Service
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