| Business | Phone |
| Atsi Inc 9200 Calumet Ave # N500, Munster 46321 | (219) 836-8490 |
| Cascade Engineering & Graphics 243 Ridge Rd, Munster 46321 | (219) 836-2583 |
| Enertronics Engineering Corp 9245 Calumet Ave # 205, Munster 46321 | (219) 836-2120 |
| Environmental Process Tchnlgs 9305 Calumet Ave # F1, Munster 46321 | (219) 836-1000 |
| Goldberg Engineering & Constr 1834 Azalea Dr, Munster 46321 | (219) 838-3017 |
| R L Millies & Assoc 9711 Valparaiso Dr # A, Munster 46321 | (219) 924-5082 |
| Safealert Technologies 1239 Fitzgerald Dr, Munster 46321 | (219) 924-6440 |
| Torrenga Engineering Inc 907 Ridge Rd # 3, Munster 46321 | (219) 836-8918 |