| Place Name | Allendale |
| Place Type | Census Designated Place |
| ZIP Code(s) | 95688 |
| County | Solano County |
| Area Code(s) | 707 |
| Timezone | Pacific Daylight Time (PDT) |
| Population (2022) | 1,721 |
| Population Growth Rate (2010-19) | 9.63% |
| Majority Ethnicity | White 71.4% |
| Metro/Micro Stats Area | Vallejo, CA |
| US Congressional District(s) | California 3rd |
| State Assembly Districts | 4 |
| State Senate Districts | 3 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 71.4% |
| African American | 12.66% |
| Hispanic | 0.46% |
| Asian | 0.75% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 14.73% |