| ZIP | County | State | Area Code | Time Zone |
| 46401 | Lake | IN | 219 | CST |
| 46402 | Lake | IN | 219 | CST |
| 46403 | Lake | IN | 219 | CST |
| 46404 | Lake | IN | 219 | CST |
| 46405 | Lake | IN | 219 | CST |
| 46406 | Lake | IN | 219 | CST |
| 46407 | Lake | IN | 219 | CST |
| 46408 | Lake | IN | 219 | CST |
| 46409 | Lake | IN | 219 | CST |
| 46410 | Lake | IN | 219 | CST |
| 46411 | Lake | IN | 219 | CST |