Kelseyville is located in Lake county California with a geographic area of 2.9 square miles. The total population in Kelseyville is 3,657 with 56.2% male and 43.8% female. Children under age 5 represent 16.1% of the population, under age 18 equal 29.6% of the population and over age 65 is 20.9% of the population. The median household income is $42,937, per capita income is $21,053. There are a total of 1,292 housing units with 49.1% owner occupied. Education includes 32.7% of residents that are high school graduates and 13.9% with a bachelor's degree or higher. The average temperature in Kelseyville in the summer is 76 degrees, and in the winter 43 degrees.