| Business | Phone |
| Heartland Communications 734 Tama Ct, Carol Stream 60188 | (630) 665-9318 |
| Netrion Corp 380 S Schmale Rd 202, Carol Stream 60188 | (630) 510-3000 |
| Pez Consulting Inc 1213 Mccormick St, Carol Stream 60188 | (630) 933-9731 |
| Software Engineering Tchnlgs 524 Iroquois Trl, Carol Stream 60188 | (630) 653-9138 |
| Tuscher Technologies Inc 802 Stockbridge Dr, Carol Stream 60188 | (630) 714-8939 |