| Business | Phone |
| Disco Building Improvements 210 Jones St, Dubuque 52001 | (563) 557-8700 |
| Fiberchem Inc 14742 Highway 20 W, Dubuque 52003 | (563) 583-1202 |
| Qci Thermal Systems Inc 3186 Hughes Ct B, Dubuque 52003 | (563) 690-0880 |
| Ruefer Industrial & Commercial 515 E 18th St, Dubuque 52001 | (563) 557-9098 |