San joaquin is located in Fresno county California with a geographic area of 1.2 square miles. The total population in San joaquin is 4,025 with 47.0% male and 53.0% female. Children under age 5 represent 9.5% of the population, under age 18 equal 35.4% of the population and over age 65 is 5.9% of the population. The median household income is $37,225, per capita income is $12,091. There are a total of 919 housing units with 40.9% owner occupied. Education includes 16.5% of residents that are high school graduates and 0.0% with a bachelor's degree or higher. The average temperature in San joaquin in the summer is 78 degrees, and in the winter 43 degrees.