| Business | Phone |
| La Ola Ltd 840 Courtland Ave, Park Ridge 60068 | (847) 384-0931 |
| Houston Rogers Consulting Inc 1480 Renaissance Dr, Park Ridge 60068 | (847) 298-3780 |
| John Imber Assoc Ltd 310 Busse Hwy, Park Ridge 60068 | (847) 692-8000 |
| Seecon Systems Inc 2604 Dempster St 209, Park Ridge 60068 | (847) 296-1010 |