| Business | Phone |
| North Suburban Office Serv Inc 540 W Frontage Rd 3185, Winnetka 60093 | (847) 446-8917 |
| North Shore Answering Svc 1 Northfield Plz, Winnetka 60093 | (847) 441-1881 |
| Telephone Information Svc Inc 456 W Frontage Rd, Winnetka 60093 | (847) 446-7807 |