| Place Name | Newcastle |
| Place Type | City |
| ZIP Code(s) | 82701 |
| County | Weston County |
| Area Code(s) | 307 |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2022) | 3,516 |
| Population Growth Rate (2010-19) | -4.47% |
| Majority Ethnicity | White 92.38% |
| Metro/Micro Stats Area | Gillette, WY |
| US Congressional District(s) | Wyoming At-Large |
| State House Districts | 2 |
| State Senate Districts | 3 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 92.38% |
| African American | 0.28% |
| Hispanic | 1.62% |
| Asian | 0.52% |
| Native American | 2.24% |
| Hawaiin/Pacific Islander | 2.97% |