| City | State | Zip |
|---|---|---|
| Beecher | IL | 60401 |
| Cedar Lake | IN | 46303 |
| Crete | IL | 60417 |
| Crown Point | IN | 46307 |
| DeMotte | IN | 46310 |
| Dyer | IN | 46311 |
| Griffith | IN | 46319 |
| Hammond | IN | 46324 |
| Hebron | IN | 46341 |
| Highland | IN | 46322 |
| Hobart | IN | 46342 |
| Kouts | IN | 46347 |
| Lake Station | IN | 46405 |
| Lowell | IN | 46356 |
| Merrillville | IN | 46410 |
| Munster | IN | 46321 |
| Portage | IN | 46368 |
| Saint John | IN | 46373 |
| Schererville | IN | 46375 |
| Valparaiso | IN | 46383 |
| Wheatfield | IN | 46392 |
| Wheeler | IN | 46393 |
| Winfield | IN | 46307 |