| Postal Service | Crown Point |
| Division | Lake |
| Post code | 46307 |
| Postal Service | Merrillville |
| Division | Lake |
| Post code | 46410 |
| Postal Service | Hobart |
| Division | Lake |
| Post code | 46342 |
| Postal Service | East Chicago |
| Division | Lake |
| Post code | 46312 |
| Postal Service | Schererville |
| Division | Lake |
| Post code | 46375 |
| Postal Service | Munster |
| Division | Lake |
| Post code | 46321 |
| Postal Service | Hammond |
| Division | Lake |
| Post code | 46323 |
| Postal Service | Highland |
| Division | Lake |
| Post code | 46322 |
| Postal Service | Dyer |
| Division | Lake |
| Post code | 46311 |
| Postal Service | Hammond |
| Division | Lake |
| Post code | 46324 |
19 City in Lake | List of Zip Codes Location In Indiana and Your selected County Lake