New castle is located in Rockingham county New hampshire with a geographic area of square miles. The total population in New castle is 863 with 47.7% male and 52.3% female. Children under age 5 represent 3.1% of the population, under age 18 equal 21.0% of the population and over age 65 is 32.8% of the population. The median household income is $167,500, per capita income is $120,230. There are a total of 418 housing units with 90.4% owner occupied. Education includes 9.8% of residents that are high school graduates and 65.8% with a bachelor's degree or higher. The average temperature in New castle in the summer is 68 degrees, and in the winter 23 degrees.
