Humboldt is located in Humboldt county Iowa with a geographic area of 4.5 square miles. The total population in Humboldt is 4,568 with 48.4% male and 51.6% female. Children under age 5 represent 4.6% of the population, under age 18 equal 22.5% of the population and over age 65 is 23.0% of the population. The median household income is $55,640, per capita income is $30,601. There are a total of 2,064 housing units with 65.1% owner occupied. Education includes 33.0% of residents that are high school graduates and 24.9% with a bachelor's degree or higher. The average temperature in Humboldt in the summer is 71 degrees, and in the winter 23 degrees.