Fairfield is a city located in Idaho. With a 2020 population of 414, it is the 141st largest city in Idaho and the 14128th largest city in the United States. Fairfield is currently growing at a rate of 0.73% annually but its population has decreased by -0.48% since the most recent census, which recorded a population of 416 in 2010. Fairfield reached it's highest population of 416 in 2010. Spanning over 1 miles, Fairfield has a population density of 473 people per square mile.
The average household income in Fairfield is $69,351 with a poverty rate of 38.91%. The median rental costs in recent years comes to $845 per month, and the median house value is $107,900. The median age in Fairfield is 27.6 years, 27.5 years for males, and 33.3 years for females. For every 100 females there are 104.6 males.