| Place Name | Monacillo |
| Place Type | Barrio |
| ZIP Code(s) | 00926 00969 |
| County | San Juan |
| Area Code(s) | 787,939 |
| Timezone | Atlantic Standard Time (AST) |
| Population (2021) | 10,293 |
| Majority Ethnicity | Hispanic 0.15% |
| Metro/Micro Stats Area | San Juan-Bayamón-Caguas, PR |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 34.57% |
| African American | 5.55% |
| Hispanic | 0.15% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 59.74% |