- Sandwich Shop Restaurants, Dover
- Satellite TV Service, Dover
- Sawmill & Planing Mills, Dover
- Sawmill Supplies & Equipment Repair, Dover
- Scrapbooks & Scrapbook Supplies, Dover
- Screen Printing, Dover
- Secondary Schools, Dover
- Senior Citizens Centers & Meals, Dover
- Senior Citizens Service & Health Organizations, Dover
- Shopping & Shopping Services, Dover
- Ski Centers, Dover
- Ski Resorts, Dover
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- Social Clubs & Organizations, Dover
- Social Services & Welfare, Dover
- Spare Rib Restaurants, Dover
- Specialty Animal Services, Dover
- Specialty Stores, Dover
- Speech & Hearing Specialists, Dover
- Sporting Goods Stores, Dover
- State Government, Dover
- State Highway Patrol, Dover
- State Law Enforcement, Dover
- Substance Abuse Clinics, Dover - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Dover - Surveying Service
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