Monument is located in Grant county Oregon with a geographic area of 0.5 square miles. The total population in Monument is 134 with 35.1% male and 64.9% female. Children under age 5 represent 0.0% of the population, under age 18 equal 4.5% of the population and over age 65 is 54.5% of the population. The median household income is $31,638, per capita income is $29,737. There are a total of 116 housing units with 83.6% owner occupied. Education includes 57.8% of residents that are high school graduates and 1.7% with a bachelor's degree or higher. The average temperature in Monument in the summer is 68 degrees, and in the winter 35 degrees.