| Business | Phone |
| Aerolite & Assoc Inc 1475 Glen Lake Rd 2e, Schaumburg 60194 | (847) 310-1118 |
| Altronics Inc 1411 S Roselle Rd, Schaumburg 60193 | (847) 923-0002 |
| Anderson Engineering 817 Morse Ave, Schaumburg 60193 | (847) 891-1015 |
| Applied Geoscience Inc 2385 Hammond Dr 6, Schaumburg 60173 | (847) 303-0300 |
| Ballas Engineering Inc 1251 N Plum Grove Rd, Schaumburg 60173 | (847) 843-3500 |
| Brian Berg & Assoc Ltd 801 W Wise Rd, Schaumburg 60193 | (847) 352-4500 |
| Foundation Engineering Inc 650 Morse Ave, Schaumburg 60193 | (847) 882-2450 |
| Engineered Fluid Power 1437 Payne Rd, Schaumburg 60173 | (847) 882-6161 |
| Doherty & Assoc 1424 Cabot Ln, Schaumburg 60193 | (847) 352-5760 |
| Continental Engineers & Survey 2099 Stonington Ave, Schaumburg 60194 | (847) 885-3326 |