Humboldt Utilities
- Supplies electricity, natural gas, public water, and wastewater service in the city and some surrounding areas. Includes rates, history, and customer service information.
- http://www.humboldtutilities.com/

Three Way Tractor
- Dealer offers tractors and mowing equipment. Includes brand and model information.
- http://www.threewaytractor.com/

Gene Langley Ford Inc.
- New and used auto dealer. Information on new models, new vehicle warranty, location, and hours of operation.
- http://www.genelangleyford.com

Jones Companies, Ltd
- Manufacturer of mop yarn and other coarse yarns for diverse applications. Includes archive of news media articles about the company and information about its technologies.
- http://www.jonesyarn.com/

Humboldt Chrysler-Dodge-Jeep, Inc.
- Auto dealer provides new and used car inventories and information about service department, parts, financing, and other topics.
- http://www.humboldtcdj.com