New Castle town
- County:
- Rockingham County
- County Seat:
- No
- Area (mi²):
- 0.809
- State:
- New Hampshire
New Castle town is located in Rockingham County, New Hampshire. New Castle town has a 2026 population of 1,001. New Castle town is currently growing at a rate of 0.4% annually and its population has increased by 0.81% since the most recent census, which recorded a population of 993 in 2020.
The median household income in New Castle town is $176,953 with a poverty rate of 4.59%. The median age in New Castle town is 62.8 years: 54.3 years for males, and 64.8 years for females. For every 100 females there are 104.7 males.