- Sales & Marketing Consultant, Martinsville
- Sandwich Shop Restaurants, Martinsville
- Savings & Loan Associations, Martinsville
- Savings Banks, Martinsville
- Schools - Multimedia & Digital Arts, Martinsville
- Secondary Schools, Martinsville
- Security & Surveillance System & Equipment, Martinsville
- Security Alarm Systems - Home & Business, Martinsville
- Security Brokers & Dealers, Martinsville
- Security Control Systems & Monitoring, Martinsville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Martinsville
- Sheet Metal Contractors, Martinsville - Sheet Metal Fabrication
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- Sheet Metal Fabricators & Ductwork Contractors, Martinsville
- Shopping & Shopping Services, Martinsville
- Snacks & Desserts, Martinsville
- Social Service Organizations Volunteer Services, Martinsville
- Social Services & Welfare, Martinsville
- Special Interest Schools Or Instruction, Martinsville
- Specialty Stores, Martinsville
- Speech & Hearing Specialists, Martinsville
- Speech Pathologists, Martinsville - Speech & Language Therapy
- Steel Pipes & Tubes Manufacturers, Martinsville
- Stone Setting Contractors, Martinsville
- Submarine Sandwich Restaurants, Martinsville
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