| Place Name | Upper Stewartsville |
| Place Type | Census Designated Place |
| ZIP Code(s) | 08886 |
| County | Warren County |
| Area Code(s) | 908 |
| Timezone | Eastern Standard Time (EST) |
| Population (2022) | 405 |
| Population Growth Rate (2010-19) | 55.19% |
| Majority Ethnicity | White 93.96% |
| Metro/Micro Stats Area | Allentown-Bethlehem-Easton, PA-NJ |
| US Congressional District(s) | New Jersey 7th |
| State Assembly Districts | 23 |
| State Senate Districts | 23 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 93.96% |
| African American | 2.2% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 3.85% |