ZIP Code 03589 is located in Mount Washington New Hampshire. 03589 is entirely within Coos County. Regionally, 03589 is located in the Northern New Hampshire Region.
| ZIP Code Name | Mount Washington |
| Primary County | Coos County |
| ZIP Code Type | PO Box |
| Current Time | EDT |
| Coordinates | 44.28099442,-71.29433441 |
| Adjacent ZIP Codes | |
| Region | Northern New Hampshire Region |
| Metropolitan/Micropolitan Stat Area | Berlin, NH |
| Time Zone | Eastern Daylight Time |
| IANA Timezone | America/New_York |