| Place Name | Callao |
| Place Type | City |
| ZIP Code(s) | 63534 |
| County | Macon County |
| Area Code(s) | 660 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 297 |
| Population Growth Rate (2010-19) | -14.04% |
| Majority Ethnicity | White 99.1% |
| US Congressional District(s) | Missouri 6th |
| State House Districts | 6 |
| State Senate Districts | 18 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 99.1% |
| African American | 0.9% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |