| Business | Phone |
| Convergence Engineering 1100 W Lloyd Expy, Evansville 47708 | (641) 791-2367 |
| Ecs Engineering 2616 Kotter Ave, Evansville 47715 | (812) 479-5170 |
| George Koch Sons Llc 1708 S Center St, Evansville 47712 | (641) 752-6711 |
| Mills Engineering Inc 10301 Upper Mount Vernon Rd, Evansville 47712 | (812) 985-3043 |
| Landmark Design & Engineering 5250 Vogel Rd, Evansville 47715 | (812) 473-5800 |