| Business | Phone |
| Associated Engineering Conslnt 3600 E State St 215, Rockford 61108 | (815) 399-3381 |
| Atom Engineering 2324 Charles St, Rockford 61104 | (815) 397-9572 |
| Rws Design & Control Inc 4320 Spring Creek Rd, Rockford 61107 | (815) 316-2870 |
| Crawford Murphy & Tilly Inc 2 Airport Cir 201, Rockford 61109 | (815) 963-9375 |
| Reister Engineering 1440 21st St 100, Rockford 61108 | (815) 227-0100 |
| Geekman Design Rockford 61108 | (815) 398-5785 |
| General Energy Corp 2314 Delcy Dr, Rockford 61107 | (815) 966-2420 |
| Miller's Services 922 Parkview Ave, Rockford 61107 | (815) 397-4375 |
| Minkwitz Design Svc 1100 Buchanan St, Rockford 61101 | (815) 968-5900 |
| Mizen Engineering Co 1603 Greenmount St, Rockford 61107 | (815) 968-9700 |
| Motor-Mation & Assoc Rockford 61108 | (815) 226-8033 |
| Mep Consultants 1039 Harlem Blvd, Rockford 61103 | (815) 489-0933 |
| Infratek Engineers 3600 E State St 316, Rockford 61108 | (815) 227-0280 |
| Ingenium Technologies 4216 Maray Dr A1, Rockford 61107 | (815) 399-8803 |
| J S Cad-Scan Technologies 5312 Falcon Rd, Rockford 61109 | (815) 394-1881 |
| Kjww Engineering 416 E State St, Rockford 61104 | (815) 968-5599 |
| Leatherman Facilities & Prcss 4663 Sunderman Rd, Rockford 61114 | (815) 282-1136 |