Lancaster is located in Coos county New hampshire with a geographic area of 3.0 square miles. The total population in Lancaster is 1,892 with 49.7% male and 50.3% female. Children under age 5 represent 6.4% of the population, under age 18 equal 20.2% of the population and over age 65 is 20.0% of the population. The median household income is $58,708, per capita income is $28,491. There are a total of 788 housing units with 69.2% owner occupied. Education includes 42.5% of residents that are high school graduates and 28.0% with a bachelor's degree or higher. The average temperature in Lancaster in the summer is 68 degrees, and in the winter 23 degrees.