Mount oliver is located in Allegheny county Pennsylvania with a geographic area of 0.3 square miles. The total population in Mount oliver is 3,304 with 48.6% male and 51.4% female. Children under age 5 represent 3.2% of the population, under age 18 equal 26.8% of the population and over age 65 is 11.9% of the population. The median household income is $31,890, per capita income is $19,332. There are a total of 1,340 housing units with 46.9% owner occupied. Education includes 40.1% of residents that are high school graduates and 18.3% with a bachelor's degree or higher. The average temperature in Mount oliver in the summer is 73 degrees, and in the winter 33 degrees.