| Place Name | San Carlos |
| Place Type | Census Designated Place |
| ZIP Code(s) | 78542 |
| County | Hidalgo County |
| Area Code(s) | 956 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 3,840 |
| Population Growth Rate (2010-19) | -1.37% |
| Majority Ethnicity | Hispanic 0% |
| Metro/Micro Stats Area | McAllen-Edinburg-Mission, TX |
| US Congressional District(s) | Texas 15th |
| State House Districts | 40 |
| State Senate Districts | 27 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 42.22% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 57.78% |