Fairfield is located in Teton county Montana with a geographic area of 0.3 square miles. The total population in Fairfield is 690 with 46.5% male and 53.5% female. Children under age 5 represent 4.8% of the population, under age 18 equal 29.0% of the population and over age 65 is 16.8% of the population. The median household income is $63,365, per capita income is $26,786. There are a total of 262 housing units with 68.7% owner occupied. Education includes 32.8% of residents that are high school graduates and 21.4% with a bachelor's degree or higher. The average temperature in Fairfield in the summer is 69 degrees, and in the winter 27 degrees.