| Business | Phone |
| Humboldt County Engineer 2221 220th St, Humboldt 50548 | (515) 332-2366 |
| Humboldt County Extension Svc 727 Sumner Ave, Humboldt 50548 | (515) 332-2201 |
| Humboldt County Mntnc Garage 2221 220th St, Humboldt 50548 | (515) 332-1953 |
| Humboldt County Mntnc Garage 307 2nd St N, Humboldt 50548 | (515) 332-1737 |