| Business | Phone |
| Apm Engineers Inc 1243 Brown St 2a, Des Plaines 60016 | (847) 298-5882 |
| Fullerton Engineering 9700 W Higgins Rd, Des Plaines 60018 | (847) 292-0200 |
| G & C Consulting Engineers 1870 Busse Hwy 201, Des Plaines 60016 | (847) 827-9430 |
| Engineering Professionals Ltd 1354 Harding Ave, Des Plaines 60016 | (847) 390-0500 |
| Dynacept Inc 2250 E Devon Ave, Des Plaines 60018 | (847) 299-4848 |
| Christopher B Burke Engnrng 9575 W Higgins Rd 600, Des Plaines 60018 | (847) 823-0500 |
| Concept Mechanical Engineering 730 E Thacker St, Des Plaines 60016 | (847) 296-3675 |
| Conrad De Latour & Assoc Inc 1221 Rand Rd, Des Plaines 60016 | (847) 635-6096 |