Fort sumner is located in De baca county New mexico with a geographic area of 3.3 square miles. The total population in Fort sumner is 1,301 with 59.8% male and 40.2% female. Children under age 5 represent 13.7% of the population, under age 18 equal 46.7% of the population and over age 65 is 13.7% of the population. The median household income is $32,375, per capita income is $14,769. There are a total of 315 housing units with 62.2% owner occupied. Education includes 29.2% of residents that are high school graduates and 7.3% with a bachelor's degree or higher. The average temperature in Fort sumner in the summer is 71 degrees, and in the winter 32 degrees.