| Business | Phone |
| Humboldt Red Power Inc 2050 13th St N, Humboldt 50548 | (515) 332-1702 |
| K C Nielsen Ltd 2228 220th St, Humboldt 50548 | (515) 332-2545 |
| M D Products 1998 215th St, Humboldt 50548 | (515) 332-3550 |
| S & L Equipment 2229 220th St, Humboldt 50548 | (515) 332-4920 |