Farmington is located in Whitman county Washington with a geographic area of 0.4 square miles. The total population in Farmington is 142 with 62.7% male and 37.3% female. Children under age 5 represent 9.2% of the population, under age 18 equal 15.5% of the population and over age 65 is 18.3% of the population. The median household income is $47,917, per capita income is $28,115. There are a total of 76 housing units with 88.2% owner occupied. Education includes 38.2% of residents that are high school graduates and 11.8% with a bachelor's degree or higher. The average temperature in Farmington in the summer is 60 degrees, and in the winter 42 degrees.