
Newcastle
- County:
- Weston County
- County Seat:
- Yes
- Area (mi²):
- 2.561
- State:
- Wyoming
Newcastle is a city located in Weston County, Wyoming. Newcastle has a 2025 population of 3,305. It is also the county seat of Weston County. Newcastle is currently declining at a rate of -0.3% annually and its population has decreased by -1.55% since the most recent census, which recorded a population of 3,357 in 2020.
The average household income in Newcastle is $86,750 with a poverty rate of 9.33%. The median age in Newcastle is 37.5 years: 35.9 years for males, and 38.8 years for females.