- Sand Gravel & Aggregate, Hertford
- Sandwich Shop Restaurants, Hertford
- Satellite Descrambling & Programming Service, Hertford
- Satellite Dish Antennas & Equipment Dealers, Hertford
- Satellite TV Service, Hertford
- Screen Printing, Hertford
- Seafood Restaurants, Hertford
- Secondary Schools, Hertford
- Secretarial & Court Reporting Services, Hertford
- Seeds & Bulbs Wholesale & Growers, Hertford
- Sewage Septic Service, Hertford
- Sewer & Drain Cleaning & Repair, Hertford - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Hertford
- Small Appliances, Hertford
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- Social Services & Welfare, Hertford
- Societies & Foundation Associations, Hertford
- Sod & Sodding Service, Hertford
- Sod Farms, Hertford
- Special Education & Care, Hertford
- Specialty Stores, Hertford
- Sporting Goods Stores, Hertford
- Sports Promoters & Managers, Hertford
- Sports Promotions & Special Events, Hertford
- Staffing & Support Services, Hertford
- State Government, Hertford
- Substance Abuse Services, Hertford
- Swimming Pools Supplies, Equipment & Accessories, Hertford
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