| Business | Phone |
| Automated Microsystems 4811 Pioneer Rd, Mchenry 60050 | (815) 385-2442 |
| Op Con Computer Co 1713 N Leonard Ave, Mchenry 60050 | (815) 363-0172 |
| Networks Computers & Consult 721 Ridgeview Dr, Mchenry 60050 | (815) 344-1410 |
| Microcomputer Devices Inc 510 Kensington Dr, Mchenry 60050 | (815) 344-6355 |