Mount rainier is located in Prince george's county Maryland with a geographic area of 0.6 square miles. The total population in Mount rainier is 8,149 with 49.2% male and 50.8% female. Children under age 5 represent 5.8% of the population, under age 18 equal 15.8% of the population and over age 65 is 12.8% of the population. The median household income is $57,200, per capita income is $35,290. There are a total of 3,963 housing units with 24.8% owner occupied. Education includes 24.4% of residents that are high school graduates and 35.3% with a bachelor's degree or higher. The average temperature in Mount rainier in the summer is 76 degrees, and in the winter 37 degrees.