- Salesperson, Eureka
- Sand Gravel & Aggregate, Eureka
- Sandwich Shop Restaurants, Eureka
- Satellite Dish Antennas & Equipment Dealers, Eureka
- Satellite TV Service, Eureka
- Savings Banks, Eureka
- Schools For The Deaf, Eureka
- Security Alarm Systems - Home & Business, Eureka
- Security Control Systems & Monitoring, Eureka - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Eureka
- Semiconductors & Equipment, Eureka
- Senior Citizens Service & Health Organizations, Eureka
- Septic Tank Pumping & Cleaning, Eureka - Septic Systems
- Septic Tanks & Systems Contractors & Designers, Eureka
- Sewing & Yarn Stores & Supplies, Eureka
- Sewing Contractors, Eureka
- Shoe Repair Shops, Eureka
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- Shoe Store - More, Eureka
- Shopping & Shopping Services, Eureka
- Signs, Eureka
- Small Engine Parts Wholesale, Eureka
- Snow Removal Services, Eureka - Snow Plow Service
- Social Clubs & Organizations, Eureka
- Social Services & Welfare, Eureka
- Special Education & Care, Eureka
- Specialty Animal Services, Eureka
- Specialty Goods Storage, Eureka
- Specialty Stores, Eureka
- Sporting Goods Stores, Eureka
- Staffing & Support Services, Eureka
- Stamp Collecting & Coin Dealers , Eureka
- State Government, Eureka
- Substance Abuse Clinics, Eureka - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Eureka - Surveying Service
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