- Salvage Yards, Junk Yards & Wrecker Service, Dover
- Sandblasting, Dover - General Contractors
- Sandwich Shop Restaurants, Dover
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Dover
- Scrap & Waste Materials, Dover
- Screen Printing, Dover
- Secondary Schools, Dover
- Security & Surveillance System & Equipment, Dover
- Security Alarm Systems - Home & Business, Dover
- Security Brokers & Dealers, Dover
- Security Control Systems & Monitoring, Dover - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Dover
- Senior Citizens Centers & Meals, Dover
- Senior Citizens Service & Health Organizations, Dover
- Sewer & Drain Cleaning & Repair, Dover - Drain Cleaner & Installation Services
- Sheet Metal, Dover
- Sheet Metal Contractors, Dover - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Dover
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, Dover - Sheet Metal Products
- Shoe Store - More, Dover
- Shooting & Target Ranges, Dover
- Shopping & Shopping Services, Dover
- Siding Contractors, Dover - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Dover
- Skating Rink & Hockey Operation Services, Dover
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- Small Appliances, Dover
- Social Services & Welfare, Dover
- Societies & Foundation Associations, Dover
- Soil Testing Labs, Dover - Concrete Testing
- Special Events & Party Supply Rental, Dover
- Specialty Animal Services, Dover
- Specialty Communication Companies & Services, Dover
- Specialty Stores, Dover
- Speech & Hearing Specialists, Dover
- Sporting Goods Stores, Dover
- Sports Promoters & Managers, Dover
- Sports Promotions & Special Events, Dover
- Stamp Collecting & Coin Dealers , Dover
- State Government, Dover
- Steel & Metal Goods, Dover - Steel Distributors
- Steel Manufacturers, Dover
- Steel Pipes & Tubes Manufacturers, Dover
- Stocks & Bond Brokers, Dover
- Stone, Dover
- Stoves & Furnace Equipment, Dover - Fittings & Repair Parts
- Surveyor Services, Dover - Surveying Service
- Surveyors, Dover
- Swimming Pools, Dover
- Swimming Pools Supplies, Equipment & Accessories, Dover
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