| Business | Phone |
| Ssi Embedded Systems 489 Taft Ave, Glen Ellyn 60137 | (630) 858-0362 |
| Inellegent Technical Solutions 875 Roosevelt Rd, Glen Ellyn 60137 | (630) 942-9100 |
| Infotech Resources Inc 800 Roosevelt Rd C16, Glen Ellyn 60137 | (630) 469-9999 |
| Kinsey & Kinsey 26 N Park Blvd, Glen Ellyn 60137 | (630) 858-4866 |
| Memory Source 800 Roosevelt Rd 116, Glen Ellyn 60137 | (630) 942-0850 |
| Oak Enterprises Staffing Svc 800 Roosevelt Rd E120, Glen Ellyn 60137 | (630) 858-4443 |
| Pgk Consulting Inc 340 Fairview Ave, Glen Ellyn 60137 | (630) 545-0501 |
| Red Oak Data Systems Inc 23w014 Red Oak Dr, Glen Ellyn 60137 | (630) 858-0030 |
| Weiskopf Consulting 244 Cumnor Ave, Glen Ellyn 60137 | (630) 660-3567 |
| Z-Axis Corp 479 N Main St, Glen Ellyn 60137 | (630) 858-2947 |