Susanville is located in Lassen county California with a geographic area of 7.9 square miles. The total population in Susanville is 14,922 with 78.0% male and 22.0% female. Children under age 5 represent 3.2% of the population, under age 18 equal 13.6% of the population and over age 65 is 7.4% of the population. The median household income is $47,685, per capita income is $11,797. There are a total of 2,784 housing units with 47.7% owner occupied. Education includes 31.3% of residents that are high school graduates and 16.0% with a bachelor's degree or higher. The average temperature in Susanville in the summer is 67 degrees, and in the winter 43 degrees.