Boulder is located in Boulder county Colorado with a geographic area of 26.3 square miles. The total population in Boulder is 108,777 with 51.6% male and 48.4% female. Children under age 5 represent 3.0% of the population, under age 18 equal 12.3% of the population and over age 65 is 11.6% of the population. The median household income is $72,279, per capita income is $49,050. There are a total of 43,378 housing units with 49.6% owner occupied. Education includes 5.2% of residents that are high school graduates and 69.6% with a bachelor's degree or higher. The average temperature in Boulder in the summer is 69 degrees, and in the winter 29 degrees.