Firth is located in Bingham county Idaho with a geographic area of 0.6 square miles. The total population in Firth is 568 with 54.8% male and 45.2% female. Children under age 5 represent 5.3% of the population, under age 18 equal 31.9% of the population and over age 65 is 13.6% of the population. The median household income is $57,115, per capita income is $21,199. There are a total of 196 housing units with 56.6% owner occupied. Education includes 51.5% of residents that are high school graduates and 15.8% with a bachelor's degree or higher. The average temperature in Firth in the summer is 65 degrees, and in the winter 24 degrees.