Lexington park is located in St. mary's county Maryland with a geographic area of 6.1 square miles. The total population in Lexington park is 12,934 with 48.5% male and 51.5% female. Children under age 5 represent 7.6% of the population, under age 18 equal 23.5% of the population and over age 65 is 6.0% of the population. The median household income is $72,920, per capita income is $35,923. There are a total of 5,501 housing units with 38.0% owner occupied. Education includes 27.3% of residents that are high school graduates and 31.6% with a bachelor's degree or higher. The average temperature in Lexington park in the summer is 74 degrees, and in the winter 37 degrees.