- Scales Retail, Alexander
- Scientific & Laboratory Equipment & Instruments, Alexander
- Scientific Services, Alexander
- Secondary Schools, Alexander
- Septic Tank Installation & Repair, Alexander - Septic Systems
- Septic Tank Pumping & Cleaning, Alexander - Septic Systems
- Septic Tanks & Septic Systems Contractors, Alexander - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Service Establishment Supplies & Equipment, Alexander
- Sewer Companies, Alexander
- Ship & Boat Building & Repairing, Alexander
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- Shopping & Shopping Services, Alexander
- Social Services & Welfare, Alexander
- Special Events & Party Supply Rental, Alexander
- Specialty Animal Services, Alexander
- Specialty Communication Companies & Services, Alexander
- Specialty Stores, Alexander
- Steel & Metal Goods, Alexander - Steel Distributors
- Store Fixtures & Display Equipment, Alexander
- Sunrooms & Solarium Construction Contractors, Alexander - Build & Repair
- Sunrooms, Greenhouses, Solariums & Atrium Builders, Alexander - Build & Repair
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