Hartford is located in Washington county Wisconsin with a geographic area of 8.4 square miles. The total population in Hartford is 15,228 with 49.2% male and 50.8% female. Children under age 5 represent 6.7% of the population, under age 18 equal 25.2% of the population and over age 65 is 15.2% of the population. The median household income is $61,915, per capita income is $30,388. There are a total of 5,935 housing units with 66.7% owner occupied. Education includes 31.3% of residents that are high school graduates and 26.6% with a bachelor's degree or higher. The average temperature in Hartford in the summer is 68 degrees, and in the winter 17 degrees.