| Business | Phone |
| Alliance Group Technologies 8252 Virginia St # A, Merrillville 46410 | (219) 736-3855 |
| Burke Engineering 632 W 81st Ave, Merrillville 46410 | (219) 736-8100 |
| Butler Fairman & Seufert 509 W 84th Dr, Merrillville 46410 | (219) 769-2333 |
| Didier-M & P Engineering Inc 1000 E 80th Pl # 400s, Merrillville 46410 | (219) 756-1061 |
| Enspect Inc 8896 Louisiana St, Merrillville 46410 | (219) 736-6002 |
| Midwest Engineering Svc 8634 Louisiana Pl, Merrillville 46410 | (219) 795-1271 |
| R W Armstrong & Assoc 8300 Broadway # E1, Merrillville 46410 | (219) 738-2258 |
| Robinson Engineering Ltd 253 W 80th Pl, Merrillville 46410 | (219) 736-9350 |