Firth is a city located in Bingham County Idaho. With a 2020 population of 521, it is the 124th largest city in Idaho and the 13124th largest city in the United States . Firth is currently growing at a rate of 2.16% annually and its population has increased by 9.22% since the most recent census, which recorded a population of 477 in 2010. Firth reached it's highest population of 521 in 2021. Spanning over 1 miles, Firth has a population density of 909 people per square mile.
The average household income in Firth is $53,769 with a poverty rate of 12.21%. The median rental costs in recent years comes to $618 per month, and the median house value is $101,500. The median age in Firth is 34.5 years, 30.8 years for males, and 36.3 years for females.