Brookfield is located in Linn county Missouri with a geographic area of 4.3 square miles. The total population in Brookfield is 4,265 with 47.4% male and 52.6% female. Children under age 5 represent 5.7% of the population, under age 18 equal 23.8% of the population and over age 65 is 21.9% of the population. The median household income is $42,109, per capita income is $21,933. There are a total of 1,828 housing units with 64.6% owner occupied. Education includes 46.4% of residents that are high school graduates and 15.4% with a bachelor's degree or higher. The average temperature in Brookfield in the summer is 74 degrees, and in the winter 32 degrees.