- Sandwich Shop Restaurants, Humboldt
- Savings Banks, Humboldt
- Seafood Restaurants, Humboldt
- Secondary Schools, Humboldt
- Security Brokers & Dealers, Humboldt
- Senior Citizens Service & Health Organizations, Humboldt
- Septic Tank Installation & Repair, Humboldt - Septic Systems
- Septic Tank Pumping & Cleaning, Humboldt - Septic Systems
- Septic Tanks & Septic Systems Contractors, Humboldt - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Service Establishment Supplies & Equipment, Humboldt
- Sewer & Drain Cleaning & Repair, Humboldt - Drain Cleaner & Installation Services
- Ship & Boat Building & Repairing, Humboldt
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- Shopping & Shopping Services, Humboldt
- Signs, Humboldt
- Social Services & Welfare, Humboldt
- Special Education & Care, Humboldt
- Specialty Stores, Humboldt
- Speech & Hearing Specialists, Humboldt
- Staffing & Support Services, Humboldt
- Stocks & Bond Brokers, Humboldt
- Stone, Humboldt
- Submarine Sandwich Restaurants, Humboldt
- Substance Abuse Clinics, Humboldt - Alcoholism, Addiction & Drug Abuse Treatment Centers
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