| Business | Phone |
| Majormicro Corp 3560 Tanbark Trl, Rockford 61102 | (815) 962-1802 |
| Engineering Services Mech 555 N Court St 103, Rockford 61103 | (815) 962-3218 |
| Norman H Meyer 2802 N Bell School Rd, Rockford 61107 | (815) 877-9109 |
| General Energy Corp 1858 Grandchester Pl, Rockford 61107 | (815) 226-8812 |
| Hilton Engineering 509 Page Pl, Rockford 61104 | (815) 968-5030 |
| Still Environmental Inc 202 W State St 502, Rockford 61101 | (815) 987-3753 |
| Ohlemacher Enterprises 6834 Clovernook Rd, Rockford 61107 | (815) 227-1829 |
| T E Meyer & Assoc 3600 E State St 215, Rockford 61108 | (815) 399-3382 |
| Wilcox Engineering 2704 Broadway, Rockford 61108 | (815) 398-0809 |
| Terracon 3384 N Publishers Dr, Rockford 61109 | (815) 873-0990 |