
Newcastle
- County:
- Lincoln County
- County Seat:
- No
- Area (mi²):
- 29.052
- State:
- Maine
Newcastle is located in Lincoln County, Maine. Newcastle has a 2025 population of 1,908. Newcastle is currently growing at a rate of 0.16% annually and its population has increased by 3.19% since the most recent census, which recorded a population of 1,849 in 2020.
The average household income in Newcastle is $111,732 with a poverty rate of 4.11%. The median age in Newcastle is 51.1 years: 52 years for males, and 49.7 years for females.