| Business | Phone |
| Directory Publisher Svc 1 Northfield Plz 300, Winnetka 60093 | (847) 441-2961 |
| Universal Publishing 1 Northfield Plz, Winnetka 60093 | (847) 441-3230 |
| Long Term Care News 1 Northfield Plz 521, Winnetka 60093 | (847) 784-8706 |
| Media Vehicles Age Capital 1 Northfield Plz, Winnetka 60093 | (847) 441-3252 |
| Penton Media Inc 1158 Oak St, Winnetka 60093 | (847) 784-9825 |
| Star One Media 279 Woodley Rd, Winnetka 60093 | (630) 365-0600 |