| Place Name | Rock Island |
| Place Type | Census Designated Place |
| ZIP Code(s) | 77442 |
| County | Colorado County |
| Area Code(s) | 979 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 447 |
| Majority Ethnicity | White 77.13% |
| US Congressional District(s) | Texas 10th |
| State House Districts | 13 |
| State Senate Districts | 18 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 77.13% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 22.87% |