- Safety Equipment & Supplies, Belmont
- Sand Gravel & Aggregate, Belmont
- Screen Printing, Belmont
- Secondary Schools, Belmont
- Secretarial & Court Reporting Services, Belmont
- Security Brokers & Dealers, Belmont
- Security Services, Belmont
- Senior Citizens Service & Health Organizations, Belmont
- Septic Tank Installation & Repair, Belmont - Septic Systems
- Septic Tank Pumping & Cleaning, Belmont - Septic Systems
- Septic Tanks & Septic Systems Contractors, Belmont - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Service Establishment Supplies & Equipment, Belmont
- Shopping & Shopping Services, Belmont
- Sign Supplies & Sign Making Equipment, Belmont
- Signs, Belmont
- Ski Centers, Belmont
- Ski Resorts, Belmont
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- Skin Care & Cosmetology Salons, Belmont
- Sleep Disorders Treatment & Information Centers, Belmont
- Small Business & Office Equipment Repair Services, Belmont
- Social Clubs & Organizations, Belmont
- Social Services & Welfare, Belmont
- Societies & Foundation Associations, Belmont
- Sod & Sodding Service, Belmont
- Special Coatings, Belmont - Protective Coatings
- Special Dies Tools Jigs & Fixtures Manufacturers, Belmont
- Special Events & Party Supply Rental, Belmont
- Specialty Stores, Belmont
- Sports & Recreational Services, Belmont
- Sports Clubs, Belmont
- Sprinkler Alarm Systems, Belmont - Fire Sprinkler Systems
- Steel Manufacturers, Belmont
- Steel Rule Dies, Belmont
- Stocks & Bond Brokers, Belmont
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