| Place Name | Newcastle |
| Place Type | Census Designated Place |
| ZIP Code(s) | 04553 |
| County | Lincoln County |
| Area Code(s) | 207 |
| Timezone | Eastern Standard Time (EST) |
| Population (2022) | 692 |
| Population Growth Rate (2010-19) | -1.05% |
| Majority Ethnicity | White 99.29% |
| US Congressional District(s) | Maine 1st |
| State House Districts | 90 |
| State Senate Districts | 13 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 99.29% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.71% |