Firth is a city located in Idaho. With a 2020 population of 508, it is the 126th largest city in Idaho and the 13237th largest city in the United States. Firth is currently growing at a rate of 1.60% annually and its population has increased by 6.50% since the most recent census, which recorded a population of 477 in 2010. Spanning over 1 miles, Firth has a population density of 886 people per square mile.
The average household income in Firth is $57,304 with a poverty rate of 11.11%. The median rental costs in recent years comes to $531 per month, and the median house value is $105,700. The median age in Firth is 35.6 years, 31.5 years for males, and 37.7 years for females. For every 100 females there are 129.5 males.