| Business | Phone |
| Brooks Borg Skiles Arch-Eng 317 6th Ave 400, Des Moines 50309 | (515) 244-7167 |
| Brown Engineering Co 5525 Meredith Dr D, Des Moines 50310 | (515) 331-1325 |
| Campbell Industries Inc 3201 Dean Ave, Des Moines 50317 | (515) 265-5331 |
| Stanley Consultants Inc 100 Court Ave 300, Des Moines 50309 | (515) 246-8585 |
| Truth About Trade & Technology 309 Court Ave, Des Moines 50309 | (515) 274-0800 |
| Paul A Walters Pe 3839 Merle Hay Rd # 215, Des Moines 50310 | (515) 270-0545 |