Foster is located in Stephens county Oklahoma with a geographic area of 34.5 square miles. The total population in Foster is 310 with 57.4% male and 42.6% female. Children under age 5 represent 3.2% of the population, under age 18 equal 27.4% of the population and over age 65 is 14.8% of the population. The median household income is $61,047, per capita income is $24,832. There are a total of 117 housing units with 85.5% owner occupied. Education includes 35.9% of residents that are high school graduates and 36.8% with a bachelor's degree or higher. The average temperature in Foster in the summer is 80 degrees, and in the winter 42 degrees.