| Business | Phone |
| Vantage Consulting Intl 888 E Belvidere Rd, Grayslake 60030 | (847) 543-7200 |
| Hanhart Consulting Inc 18720 W Heather Ct, Grayslake 60030 | (847) 548-3948 |
| Master Plans Associated 1154 Cambridge Dr, Grayslake 60030 | (847) 548-1882 |
| Johnson Consulting Svc 1167 Mockingbird Ct, Grayslake 60030 | (847) 223-8980 |