| Business | Phone |
| Allied Riser Communications 707 Skokie Blvd, Northbrook 60062 | (847) 562-9574 |
| Astro Communications 630 Dundee Rd, Northbrook 60062 | (847) 559-8854 |
| Gjd Communications 707 Skokie Blvd, Northbrook 60062 | (847) 291-4336 |
| Blue Wire Communications 1955 Raymond Dr, Northbrook 60062 | (847) 205-8000 |
| Communication Inc Metro 3570 Milwaukee Ave, Northbrook 60062 | (847) 297-0278 |
| Cypress Communications 400 Skokie Blvd, Northbrook 60062 | (847) 562-8973 |