- Sandwich Shop Restaurants, Danville
- Satellite Dish Antennas & Equipment Dealers, Danville
- Secondary Schools, Danville
- Security Alarm Systems - Home & Business, Danville
- Security Brokers & Dealers, Danville
- Security Investigative Services, Danville
- Security Services, Danville
- Senior Citizens Service & Health Organizations, Danville
- Sewer Companies, Danville
- Sewing Contractors, Danville
- Shopping & Shopping Services, Danville
- Signs, Danville
- Snacks & Desserts, Danville
- Snow Removal Services, Danville - Snow Plow Service
- Social Clubs & Organizations, Danville
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- Social Services & Welfare, Danville
- Societies & Foundation Associations, Danville
- Specialty Animal Services, Danville
- Specialty Goods Storage, Danville
- Specialty Stores, Danville
- Speech & Hearing Specialists, Danville
- Sports Bars & Lounges, Danville
- Sportswear Clothing Stores, Danville - Sports Clothes
- Staffing & Support Services, Danville
- State Government, Danville
- Stocks & Bond Brokers, Danville
- Stoves & Furnace Equipment, Danville - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Danville
- Surveyor Services, Danville - Surveying Service
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Danville
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