| Official Zip Code Name | Westby |
| Zip Code State | Montana |
| Primary County: | Sheridan |
| Area Code | 406 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 7 |
| Elevation Range | 2378 ft. |
| Area | 376.347 Sqm. |
| Coordinates(Y,X) | 48.852233, -104.221782 |