| Place Name | Underwood |
| Place Type | Unincorporated |
| ZIP Code(s) | 98651 |
| County | Skamania County |
| Area Code(s) | 509 |
| Timezone | Pacific Daylight Time (PDT) |
| Population () | |
| Metro/Micro Stats Area | Portland-Vancouver-Hillsboro, OR-WA |
| US Congressional District(s) | Washington 3rd |
| State House Districts | 17 |
| State Senate Districts | 17 |