| Place Name | Rio Oso |
| Place Type | Census Designated Place |
| ZIP Code(s) | 95674 |
| County | Sutter County |
| Area Code(s) | 530 |
| Timezone | Pacific Daylight Time (PDT) |
| Population (2022) | 322 |
| Population Growth Rate (2010-19) | 4.49% |
| Majority Ethnicity | White 90.75% |
| Metro/Micro Stats Area | Yuba City, CA |
| US Congressional District(s) | California 3rd |
| State Assembly Districts | 3 |
| State Senate Districts | 4 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 90.75% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 7.97% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.29% |