- Sandwich Shop Restaurants, Humboldt
- Satellite Dish Antennas & Equipment Dealers, Humboldt
- Screen Printing, Humboldt
- Seafood Restaurants, Humboldt
- Secondary Schools, Humboldt
- Security Brokers & Dealers, Humboldt
- Senior Citizens Information & Services, 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
- Sewer & Drain Cleaning & Repair, Humboldt - Drain Cleaner & Installation Services
- Sharpening Service, Humboldt
- Sheet Metal Contractors, Humboldt - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Humboldt
- Shoe Dyers, Humboldt
- Shoe Manufacturers Supplies, Humboldt
- Shoe Repair Shops, Humboldt
- Shoe Stores, Humboldt - Mens, Womens & Kids Shoes
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- Shopping & Shopping Services, Humboldt
- Siding Contractors, Humboldt - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Humboldt
- Social Services & Welfare, Humboldt
- Sod & Sodding Service, Humboldt
- Special Education & Care, Humboldt
- Special Events & Party Supply Rental, Humboldt
- Specialty Stores, Humboldt
- Sporting Goods Stores, Humboldt
- Staffing & Support Services, Humboldt
- State Government, Humboldt
- Steak House Restaurants, Humboldt
- Steel & Brass Stamps Manufacturers, Humboldt
- Steel & Metal Goods, Humboldt - Steel Distributors
- Stocks & Bond Brokers, Humboldt
- Substance Abuse Clinics, Humboldt - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Swimming Pool, Sauna & Spa Contractors, Humboldt
- Swimming Pools Contractors, Humboldt - Install Inground - Above Ground Pools
- Swimming Pools Supplies, Equipment & Accessories, Humboldt
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