| Place Name | Janesville |
| Place Type | Census Designated Place |
| ZIP Code(s) | 96114 |
| County | Lassen County |
| Area Code(s) | 530 |
| Timezone | Pacific Daylight Time (PDT) |
| Population (2022) | 1,564 |
| Population Growth Rate (2010-19) | 74.79% |
| Majority Ethnicity | White 79.72% |
| Metro/Micro Stats Area | Susanville, CA |
| US Congressional District(s) | California 1st |
| State Assembly Districts | 1 |
| State Senate Districts | 1 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 79.72% |
| African American | 0% |
| Hispanic | 3.59% |
| Asian | 1.24% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 15.45% |