Brentwood is located in Allegheny county Pennsylvania with a geographic area of 1.4 square miles. The total population in Brentwood is 9,319 with 45.8% male and 54.2% female. Children under age 5 represent 8.3% of the population, under age 18 equal 22.4% of the population and over age 65 is 15.6% of the population. The median household income is $58,349, per capita income is $33,296. There are a total of 4,100 housing units with 64.7% owner occupied. Education includes 30.3% of residents that are high school graduates and 27.3% with a bachelor's degree or higher. The average temperature in Brentwood in the summer is 73 degrees, and in the winter 33 degrees.