ZIP Code 59403 is located in Great Falls Montana. 59403 is entirely within Cascade County. Regionally, it is located in the Great Falls Area.
| ZIP Code Name | Great Falls |
| Primary County | Cascade County |
| ZIP Code Type | PO Box |
| Current Time | MDT |
| Coordinates | 47.50645447,-111.30383301 |
| Adjacent ZIP Codes | |
| Region | Great Falls Area |
| Metropolitan/Micropolitan Stat Area | Great Falls, MT |
| Time Zone | Mountain Daylight Time |
| IANA Timezone | America/Denver |