| Place Name | Johnsville |
| Place Type | Census Designated Place |
| ZIP Code(s) | 96103 |
| County | Plumas County |
| Area Code(s) | 530 |
| Timezone | Pacific Daylight Time (PDT) |
| Population (2022) | 24 |
| Population Growth Rate (2010-19) | 10.00% |
| US Congressional District(s) | California 1st |
| State Assembly Districts | 1 |
| State Senate Districts | 1 |