| Business | Phone |
| International Telesis Group 1801 Century Park E 2400, Glencoe 60022 | (847) 205-0525 |
| Nolan Communications Glencoe 60022 | (847) 956-3410 |
| Northbrook Consulting Group 1125 Hohlfelder Rd, Glencoe 60022 | (847) 835-0979 |
| Sam Okner Assoc 100 Timber Ln, Glencoe 60022 | (847) 835-9500 |