- Safe & Vault, Belmont
- Safety & Security Systems & Consultants, Belmont
- Sandblasting, Belmont - General Contractors
- Sandwich Shop Restaurants, Belmont
- Satellite Descrambling & Programming Service, Belmont
- Satellite Dish Antennas & Equipment Dealers, Belmont
- Satellite TV Service, Belmont
- Savings Banks, Belmont
- Science & Academic Consultants, Belmont
- Scientific & Laboratory Equipment & Instruments, Belmont
- Screen Houses, Belmont
- Seafood Restaurants, Belmont
- Secondary Schools, Belmont
- Security & Surveillance System & Equipment, Belmont
- Security Alarm Systems - Home & Business, Belmont
- Security Brokers & Dealers, Belmont
- Security Consultants, Belmont
- Security Control Systems & Monitoring, Belmont - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Belmont - Bodyguard, Guard Dogs, Etc
- Security Services, Belmont
- Semiconductors & Equipment, Belmont
- Sewer & Drain Cleaning & Repair, Belmont - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Belmont - Sewer Line, Pipe Installation & Repair Services
- Shoe Repair Shops, Belmont
- Shopping & Shopping Services, Belmont
- Signs, Belmont
- Skateboards & Equipment Shops, Belmont - Skateboarding Supplies
- Skating Rink & Hockey Operation Services, Belmont
- Smog Check, Brake & Lamp Inspection & Repair, Belmont
- Snacks & Desserts, Belmont
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- Soccer Equipment & Supplies, Belmont
- Social Clubs & Organizations, Belmont
- Social Services & Welfare, Belmont
- Social Workers & Services, Belmont
- Societies & Foundation Associations, Belmont
- Special Coatings, Belmont - Protective Coatings
- Special Education & Care, Belmont
- Special Interest Schools Or Instruction, Belmont
- Speciality Food Stores, Belmont
- Specialty Animal Services, Belmont
- Specialty Stores, Belmont
- Sporting Goods - Other, Belmont
- Sporting Goods Stores, Belmont
- Sports & Recreational Services, Belmont
- Sports Bars & Lounges, Belmont
- Sprinkler System Contractors, Belmont - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Belmont
- State Government, Belmont
- Steel & Metal Goods, Belmont - Steel Distributors
- Stocks & Bond Brokers, Belmont
- Stoves & Furnace Equipment, Belmont - Fittings & Repair Parts
- Structural Engineer, Belmont
- Substance Abuse Clinics, Belmont - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Belmont - Surveying Service
- Sushi Restaurants, Belmont
- Swimming Pool, Sauna & Spa Contractors, Belmont
- Swimming Pools Contractors, Belmont - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Belmont
- Swimming Pools Supplies, Equipment & Accessories, Belmont
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