| Business | Phone |
| Comsub Design & Engineering 8701 Parkway Dr, Highland 46322 | (219) 838-9580 |
| Siva K Haran Pe Highland 46322 | (219) 923-8864 |
| James Giannini & Assoc Inc 9219 Indianapolis Blvd # B, Highland 46322 | (219) 923-7627 |
| K & S Engineers 9715 Kennedy Ave, Highland 46322 | (219) 924-5231 |
| R J Mycka Inc 2342 Ridge Rd, Highland 46322 | (219) 972-1646 |